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 <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/regex-1.8.3/src/re_bytes.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>re_bytes.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../regex/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../regex/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span>
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 </pre><pre class="rust"><code><span class="kw">use </span>std::borrow::Cow;
 <span class="kw">use </span>std::collections::HashMap;
 <span class="kw">use </span>std::fmt;
 <span class="kw">use </span>std::iter::FusedIterator;
 <span class="kw">use </span>std::ops::{Index, Range};
 <span class="kw">use </span>std::str::FromStr;
 <span class="kw">use </span>std::sync::Arc;

 <span class="kw">use </span><span class="kw">crate</span>::find_byte::find_byte;

 <span class="kw">use </span><span class="kw">crate</span>::error::Error;
 <span class="kw">use </span><span class="kw">crate</span>::exec::{Exec, ExecNoSync};
 <span class="kw">use </span><span class="kw">crate</span>::expand::expand_bytes;
 <span class="kw">use </span><span class="kw">crate</span>::re_builder::bytes::RegexBuilder;
 <span class="kw">use </span><span class="kw">crate</span>::re_trait::{<span class="self">self</span>, RegularExpression, SubCapturesPosIter};

 <span class="doccomment">/// Match represents a single match of a regex in a haystack.
 ///
 /// The lifetime parameter `&#39;t` refers to the lifetime of the matched text.
 </span><span class="attribute">#[derive(Copy, Clone, Eq, PartialEq)]
 </span><span class="kw">pub struct </span>Match&lt;<span class="lifetime">&#39;t</span>&gt; {
     text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
     start: usize,
     end: usize,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; Match&lt;<span class="lifetime">&#39;t</span>&gt; {
     <span class="doccomment">/// Returns the starting byte offset of the match in the haystack.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>start(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.start
     }

     <span class="doccomment">/// Returns the ending byte offset of the match in the haystack.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>end(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.end
     }

     <span class="doccomment">/// Returns true if and only if this match has a length of zero.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
         <span class="self">self</span>.start == <span class="self">self</span>.end
     }

     <span class="doccomment">/// Returns the length, in bytes, of this match.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.end - <span class="self">self</span>.start
     }

     <span class="doccomment">/// Returns the range over the starting and ending byte offsets of the
     /// match in the haystack.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>range(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Range&lt;usize&gt; {
         <span class="self">self</span>.start..<span class="self">self</span>.end
     }

     <span class="doccomment">/// Returns the matched text.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>as_bytes(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8] {
         <span class="kw-2">&amp;</span><span class="self">self</span>.text[<span class="self">self</span>.range()]
     }

     <span class="doccomment">/// Creates a new match from the given haystack and byte offsets.
     </span><span class="attribute">#[inline]
     </span><span class="kw">fn </span>new(haystack: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8], start: usize, end: usize) -&gt; Match&lt;<span class="lifetime">&#39;t</span>&gt; {
         Match { text: haystack, start, end }
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; std::fmt::Debug <span class="kw">for </span>Match&lt;<span class="lifetime">&#39;t</span>&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>std::fmt::Formatter) -&gt; std::fmt::Result {
         <span class="kw">let </span><span class="kw-2">mut </span>fmt = f.debug_struct(<span class="string">&quot;Match&quot;</span>);
         fmt.field(<span class="string">&quot;start&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.start).field(<span class="string">&quot;end&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.end);
         <span class="kw">if let </span><span class="prelude-val">Ok</span>(s) = std::str::from_utf8(<span class="self">self</span>.as_bytes()) {
             fmt.field(<span class="string">&quot;bytes&quot;</span>, <span class="kw-2">&amp;</span>s);
         } <span class="kw">else </span>{
             <span class="comment">// FIXME: It would be nice if this could be printed as a string
             // with invalid UTF-8 replaced with hex escapes. A alloc would
             // probably okay if that makes it easier, but regex-automata does
             // (at time of writing) have internal routines that do this. So
             // maybe we should expose them.
             </span>fmt.field(<span class="string">&quot;bytes&quot;</span>, <span class="kw-2">&amp;</span><span class="self">self</span>.as_bytes());
         }
         fmt.finish()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; From&lt;Match&lt;<span class="lifetime">&#39;t</span>&gt;&gt; <span class="kw">for </span>Range&lt;usize&gt; {
     <span class="kw">fn </span>from(m: Match&lt;<span class="lifetime">&#39;t</span>&gt;) -&gt; Range&lt;usize&gt; {
         m.range()
     }
 }

 <span class="doccomment">/// A compiled regular expression for matching arbitrary bytes.
 ///
 /// It can be used to search, split or replace text. All searching is done with
 /// an implicit `.*?` at the beginning and end of an expression. To force an
 /// expression to match the whole string (or a prefix or a suffix), you must
 /// use an anchor like `^` or `$` (or `\A` and `\z`).
 ///
 /// Like the `Regex` type in the parent module, matches with this regex return
 /// byte offsets into the search text. **Unlike** the parent `Regex` type,
 /// these byte offsets may not correspond to UTF-8 sequence boundaries since
 /// the regexes in this module can match arbitrary bytes.
 </span><span class="attribute">#[derive(Clone)]
 </span><span class="kw">pub struct </span>Regex(Exec);

 <span class="kw">impl </span>fmt::Display <span class="kw">for </span>Regex {
     <span class="doccomment">/// Shows the original regular expression.
     </span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="macro">write!</span>(f, <span class="string">&quot;{}&quot;</span>, <span class="self">self</span>.as_str())
     }
 }

 <span class="kw">impl </span>fmt::Debug <span class="kw">for </span>Regex {
     <span class="doccomment">/// Shows the original regular expression.
     </span><span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         fmt::Display::fmt(<span class="self">self</span>, f)
     }
 }

 <span class="doccomment">/// A constructor for Regex from an Exec.
 ///
 /// This is hidden because Exec isn&#39;t actually part of the public API.
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">impl </span>From&lt;Exec&gt; <span class="kw">for </span>Regex {
     <span class="kw">fn </span>from(exec: Exec) -&gt; Regex {
         Regex(exec)
     }
 }

 <span class="kw">impl </span>FromStr <span class="kw">for </span>Regex {
     <span class="kw">type </span><span class="prelude-val">Err </span>= Error;

     <span class="doccomment">/// Attempts to parse a string into a regular expression
     </span><span class="kw">fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;Regex, Error&gt; {
         Regex::new(s)
     }
 }

 <span class="doccomment">/// Core regular expression methods.
 </span><span class="kw">impl </span>Regex {
     <span class="doccomment">/// Compiles a regular expression. Once compiled, it can be used repeatedly
     /// to search, split or replace text in a string.
     ///
     /// If an invalid expression is given, then an error is returned.
     </span><span class="kw">pub fn </span>new(re: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;Regex, Error&gt; {
         RegexBuilder::new(re).build()
     }

     <span class="doccomment">/// Returns true if and only if there is a match for the regex in the
     /// string given.
     ///
     /// It is recommended to use this method if all you need to do is test
     /// a match, since the underlying matching engine may be able to do less
     /// work.
     ///
     /// # Example
     ///
     /// Test if some text contains at least one word with exactly 13 ASCII word
     /// bytes:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// let text = b&quot;I categorically deny having triskaidekaphobia.&quot;;
     /// assert!(Regex::new(r&quot;\b\w{13}\b&quot;).unwrap().is_match(text));
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>is_match(<span class="kw-2">&amp;</span><span class="self">self</span>, text: <span class="kw-2">&amp;</span>[u8]) -&gt; bool {
         <span class="self">self</span>.is_match_at(text, <span class="number">0</span>)
     }

     <span class="doccomment">/// Returns the start and end byte range of the leftmost-first match in
     /// `text`. If no match exists, then `None` is returned.
     ///
     /// Note that this should only be used if you want to discover the position
     /// of the match. Testing the existence of a match is faster if you use
     /// `is_match`.
     ///
     /// # Example
     ///
     /// Find the start and end location of the first word with exactly 13
     /// ASCII word bytes:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// let text = b&quot;I categorically deny having triskaidekaphobia.&quot;;
     /// let mat = Regex::new(r&quot;\b\w{13}\b&quot;).unwrap().find(text).unwrap();
     /// assert_eq!((mat.start(), mat.end()), (2, 15));
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>find&lt;<span class="lifetime">&#39;t</span>&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8]) -&gt; <span class="prelude-ty">Option</span>&lt;Match&lt;<span class="lifetime">&#39;t</span>&gt;&gt; {
         <span class="self">self</span>.find_at(text, <span class="number">0</span>)
     }

     <span class="doccomment">/// Returns an iterator for each successive non-overlapping match in
     /// `text`, returning the start and end byte indices with respect to
     /// `text`.
     ///
     /// # Example
     ///
     /// Find the start and end location of every word with exactly 13 ASCII
     /// word bytes:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// let text = b&quot;Retroactively relinquishing remunerations is reprehensible.&quot;;
     /// for mat in Regex::new(r&quot;\b\w{13}\b&quot;).unwrap().find_iter(text) {
     ///     println!(&quot;{:?}&quot;, mat);
     /// }
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>find_iter&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;r </span><span class="self">self</span>, text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8]) -&gt; Matches&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {
         Matches(<span class="self">self</span>.<span class="number">0</span>.searcher().find_iter(text))
     }

     <span class="doccomment">/// Returns the capture groups corresponding to the leftmost-first
     /// match in `text`. Capture group `0` always corresponds to the entire
     /// match. If no match is found, then `None` is returned.
     ///
     /// You should only use `captures` if you need access to the location of
     /// capturing group matches. Otherwise, `find` is faster for discovering
     /// the location of the overall match.
     ///
     /// # Examples
     ///
     /// Say you have some text with movie names and their release years,
     /// like &quot;&#39;Citizen Kane&#39; (1941)&quot;. It&#39;d be nice if we could search for text
     /// looking like that, while also extracting the movie name and its release
     /// year separately.
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// let re = Regex::new(r&quot;&#39;([^&#39;]+)&#39;\s+\((\d{4})\)&quot;).unwrap();
     /// let text = b&quot;Not my favorite movie: &#39;Citizen Kane&#39; (1941).&quot;;
     /// let caps = re.captures(text).unwrap();
     /// assert_eq!(caps.get(1).unwrap().as_bytes(), &amp;b&quot;Citizen Kane&quot;[..]);
     /// assert_eq!(caps.get(2).unwrap().as_bytes(), &amp;b&quot;1941&quot;[..]);
     /// assert_eq!(caps.get(0).unwrap().as_bytes(), &amp;b&quot;&#39;Citizen Kane&#39; (1941)&quot;[..]);
     /// // You can also access the groups by index using the Index notation.
     /// // Note that this will panic on an invalid index.
     /// assert_eq!(&amp;caps[1], b&quot;Citizen Kane&quot;);
     /// assert_eq!(&amp;caps[2], b&quot;1941&quot;);
     /// assert_eq!(&amp;caps[0], b&quot;&#39;Citizen Kane&#39; (1941)&quot;);
     /// # }
     /// ```
     ///
     /// Note that the full match is at capture group `0`. Each subsequent
     /// capture group is indexed by the order of its opening `(`.
     ///
     /// We can make this example a bit clearer by using *named* capture groups:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// let re = Regex::new(r&quot;&#39;(?P&lt;title&gt;[^&#39;]+)&#39;\s+\((?P&lt;year&gt;\d{4})\)&quot;)
     ///                .unwrap();
     /// let text = b&quot;Not my favorite movie: &#39;Citizen Kane&#39; (1941).&quot;;
     /// let caps = re.captures(text).unwrap();
     /// assert_eq!(caps.name(&quot;title&quot;).unwrap().as_bytes(), b&quot;Citizen Kane&quot;);
     /// assert_eq!(caps.name(&quot;year&quot;).unwrap().as_bytes(), b&quot;1941&quot;);
     /// assert_eq!(caps.get(0).unwrap().as_bytes(), &amp;b&quot;&#39;Citizen Kane&#39; (1941)&quot;[..]);
     /// // You can also access the groups by name using the Index notation.
     /// // Note that this will panic on an invalid group name.
     /// assert_eq!(&amp;caps[&quot;title&quot;], b&quot;Citizen Kane&quot;);
     /// assert_eq!(&amp;caps[&quot;year&quot;], b&quot;1941&quot;);
     /// assert_eq!(&amp;caps[0], b&quot;&#39;Citizen Kane&#39; (1941)&quot;);
     ///
     /// # }
     /// ```
     ///
     /// Here we name the capture groups, which we can access with the `name`
     /// method or the `Index` notation with a `&amp;str`. Note that the named
     /// capture groups are still accessible with `get` or the `Index` notation
     /// with a `usize`.
     ///
     /// The `0`th capture group is always unnamed, so it must always be
     /// accessed with `get(0)` or `[0]`.
     </span><span class="kw">pub fn </span>captures&lt;<span class="lifetime">&#39;t</span>&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8]) -&gt; <span class="prelude-ty">Option</span>&lt;Captures&lt;<span class="lifetime">&#39;t</span>&gt;&gt; {
         <span class="self">self</span>.captures_at(text, <span class="number">0</span>)
     }

     <span class="doccomment">/// Returns an iterator over all the non-overlapping capture groups matched
     /// in `text`. This is operationally the same as `find_iter`, except it
     /// yields information about capturing group matches.
     ///
     /// # Example
     ///
     /// We can use this to find all movie titles and their release years in
     /// some text, where the movie is formatted like &quot;&#39;Title&#39; (xxxx)&quot;:
     ///
     /// ```rust
     /// # use std::str; use regex::bytes::Regex;
     /// # fn main() {
     /// let re = Regex::new(r&quot;&#39;(?P&lt;title&gt;[^&#39;]+)&#39;\s+\((?P&lt;year&gt;\d{4})\)&quot;)
     ///                .unwrap();
     /// let text = b&quot;&#39;Citizen Kane&#39; (1941), &#39;The Wizard of Oz&#39; (1939), &#39;M&#39; (1931).&quot;;
     /// for caps in re.captures_iter(text) {
     ///     let title = str::from_utf8(&amp;caps[&quot;title&quot;]).unwrap();
     ///     let year = str::from_utf8(&amp;caps[&quot;year&quot;]).unwrap();
     ///     println!(&quot;Movie: {:?}, Released: {:?}&quot;, title, year);
     /// }
     /// // Output:
     /// // Movie: Citizen Kane, Released: 1941
     /// // Movie: The Wizard of Oz, Released: 1939
     /// // Movie: M, Released: 1931
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>captures_iter&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt;(
         <span class="kw-2">&amp;</span><span class="lifetime">&#39;r </span><span class="self">self</span>,
         text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
     ) -&gt; CaptureMatches&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {
         CaptureMatches(<span class="self">self</span>.<span class="number">0</span>.searcher().captures_iter(text))
     }

     <span class="doccomment">/// Returns an iterator of substrings of `text` delimited by a match of the
     /// regular expression. Namely, each element of the iterator corresponds to
     /// text that *isn&#39;t* matched by the regular expression.
     ///
     /// This method will *not* copy the text given.
     ///
     /// # Example
     ///
     /// To split a string delimited by arbitrary amounts of spaces or tabs:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// let re = Regex::new(r&quot;[ \t]+&quot;).unwrap();
     /// let fields: Vec&lt;&amp;[u8]&gt; = re.split(b&quot;a b \t  c\td    e&quot;).collect();
     /// assert_eq!(fields, vec![
     ///     &amp;b&quot;a&quot;[..], &amp;b&quot;b&quot;[..], &amp;b&quot;c&quot;[..], &amp;b&quot;d&quot;[..], &amp;b&quot;e&quot;[..],
     /// ]);
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>split&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;r </span><span class="self">self</span>, text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8]) -&gt; Split&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {
         Split { finder: <span class="self">self</span>.find_iter(text), last: <span class="number">0 </span>}
     }

     <span class="doccomment">/// Returns an iterator of at most `limit` substrings of `text` delimited
     /// by a match of the regular expression. (A `limit` of `0` will return no
     /// substrings.) Namely, each element of the iterator corresponds to text
     /// that *isn&#39;t* matched by the regular expression. The remainder of the
     /// string that is not split will be the last element in the iterator.
     ///
     /// This method will *not* copy the text given.
     ///
     /// # Example
     ///
     /// Get the first two words in some text:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// let re = Regex::new(r&quot;\W+&quot;).unwrap();
     /// let fields: Vec&lt;&amp;[u8]&gt; = re.splitn(b&quot;Hey! How are you?&quot;, 3).collect();
     /// assert_eq!(fields, vec![&amp;b&quot;Hey&quot;[..], &amp;b&quot;How&quot;[..], &amp;b&quot;are you?&quot;[..]]);
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>splitn&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt;(
         <span class="kw-2">&amp;</span><span class="lifetime">&#39;r </span><span class="self">self</span>,
         text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
         limit: usize,
     ) -&gt; SplitN&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {
         SplitN { splits: <span class="self">self</span>.split(text), n: limit }
     }

     <span class="doccomment">/// Replaces the leftmost-first match with the replacement provided. The
     /// replacement can be a regular byte string (where `$N` and `$name` are
     /// expanded to match capture groups) or a function that takes the matches&#39;
     /// `Captures` and returns the replaced byte string.
     ///
     /// If no match is found, then a copy of the byte string is returned
     /// unchanged.
     ///
     /// # Replacement string syntax
     ///
     /// All instances of `$name` in the replacement text is replaced with the
     /// corresponding capture group `name`.
     ///
     /// `name` may be an integer corresponding to the index of the
     /// capture group (counted by order of opening parenthesis where `0` is the
     /// entire match) or it can be a name (consisting of letters, digits or
     /// underscores) corresponding to a named capture group.
     ///
     /// If `name` isn&#39;t a valid capture group (whether the name doesn&#39;t exist
     /// or isn&#39;t a valid index), then it is replaced with the empty string.
     ///
     /// The longest possible name is used. e.g., `$1a` looks up the capture
     /// group named `1a` and not the capture group at index `1`. To exert more
     /// precise control over the name, use braces, e.g., `${1}a`.
     ///
     /// To write a literal `$` use `$$`.
     ///
     /// # Examples
     ///
     /// Note that this function is polymorphic with respect to the replacement.
     /// In typical usage, this can just be a normal byte string:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// let re = Regex::new(&quot;[^01]+&quot;).unwrap();
     /// assert_eq!(re.replace(b&quot;1078910&quot;, &amp;b&quot;&quot;[..]), &amp;b&quot;1010&quot;[..]);
     /// # }
     /// ```
     ///
     /// But anything satisfying the `Replacer` trait will work. For example, a
     /// closure of type `|&amp;Captures| -&gt; Vec&lt;u8&gt;` provides direct access to the
     /// captures corresponding to a match. This allows one to access capturing
     /// group matches easily:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # use regex::bytes::Captures; fn main() {
     /// let re = Regex::new(r&quot;([^,\s]+),\s+(\S+)&quot;).unwrap();
     /// let result = re.replace(b&quot;Springsteen, Bruce&quot;, |caps: &amp;Captures| {
     ///     let mut replacement = caps[2].to_owned();
     ///     replacement.push(b&#39; &#39;);
     ///     replacement.extend(&amp;caps[1]);
     ///     replacement
     /// });
     /// assert_eq!(result, &amp;b&quot;Bruce Springsteen&quot;[..]);
     /// # }
     /// ```
     ///
     /// But this is a bit cumbersome to use all the time. Instead, a simple
     /// syntax is supported that expands `$name` into the corresponding capture
     /// group. Here&#39;s the last example, but using this expansion technique
     /// with named capture groups:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// let re = Regex::new(r&quot;(?P&lt;last&gt;[^,\s]+),\s+(?P&lt;first&gt;\S+)&quot;).unwrap();
     /// let result = re.replace(b&quot;Springsteen, Bruce&quot;, &amp;b&quot;$first $last&quot;[..]);
     /// assert_eq!(result, &amp;b&quot;Bruce Springsteen&quot;[..]);
     /// # }
     /// ```
     ///
     /// Note that using `$2` instead of `$first` or `$1` instead of `$last`
     /// would produce the same result. To write a literal `$` use `$$`.
     ///
     /// Sometimes the replacement string requires use of curly braces to
     /// delineate a capture group replacement and surrounding literal text.
     /// For example, if we wanted to join two words together with an
     /// underscore:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// let re = Regex::new(r&quot;(?P&lt;first&gt;\w+)\s+(?P&lt;second&gt;\w+)&quot;).unwrap();
     /// let result = re.replace(b&quot;deep fried&quot;, &amp;b&quot;${first}_$second&quot;[..]);
     /// assert_eq!(result, &amp;b&quot;deep_fried&quot;[..]);
     /// # }
     /// ```
     ///
     /// Without the curly braces, the capture group name `first_` would be
     /// used, and since it doesn&#39;t exist, it would be replaced with the empty
     /// string.
     ///
     /// Finally, sometimes you just want to replace a literal string with no
     /// regard for capturing group expansion. This can be done by wrapping a
     /// byte string with `NoExpand`:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// use regex::bytes::NoExpand;
     ///
     /// let re = Regex::new(r&quot;(?P&lt;last&gt;[^,\s]+),\s+(\S+)&quot;).unwrap();
     /// let result = re.replace(b&quot;Springsteen, Bruce&quot;, NoExpand(b&quot;$2 $last&quot;));
     /// assert_eq!(result, &amp;b&quot;$2 $last&quot;[..]);
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>replace&lt;<span class="lifetime">&#39;t</span>, R: Replacer&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
         rep: R,
     ) -&gt; Cow&lt;<span class="lifetime">&#39;t</span>, [u8]&gt; {
         <span class="self">self</span>.replacen(text, <span class="number">1</span>, rep)
     }

     <span class="doccomment">/// Replaces all non-overlapping matches in `text` with the replacement
     /// provided. This is the same as calling `replacen` with `limit` set to
     /// `0`.
     ///
     /// See the documentation for `replace` for details on how to access
     /// capturing group matches in the replacement text.
     </span><span class="kw">pub fn </span>replace_all&lt;<span class="lifetime">&#39;t</span>, R: Replacer&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
         rep: R,
     ) -&gt; Cow&lt;<span class="lifetime">&#39;t</span>, [u8]&gt; {
         <span class="self">self</span>.replacen(text, <span class="number">0</span>, rep)
     }

     <span class="doccomment">/// Replaces at most `limit` non-overlapping matches in `text` with the
     /// replacement provided. If `limit` is 0, then all non-overlapping matches
     /// are replaced.
     ///
     /// See the documentation for `replace` for details on how to access
     /// capturing group matches in the replacement text.
     </span><span class="kw">pub fn </span>replacen&lt;<span class="lifetime">&#39;t</span>, R: Replacer&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
         limit: usize,
         <span class="kw-2">mut </span>rep: R,
     ) -&gt; Cow&lt;<span class="lifetime">&#39;t</span>, [u8]&gt; {
         <span class="kw">if let </span><span class="prelude-val">Some</span>(rep) = rep.no_expansion() {
             <span class="kw">let </span><span class="kw-2">mut </span>it = <span class="self">self</span>.find_iter(text).enumerate().peekable();
             <span class="kw">if </span>it.peek().is_none() {
                 <span class="kw">return </span>Cow::Borrowed(text);
             }
             <span class="kw">let </span><span class="kw-2">mut </span>new = Vec::with_capacity(text.len());
             <span class="kw">let </span><span class="kw-2">mut </span>last_match = <span class="number">0</span>;
             <span class="kw">for </span>(i, m) <span class="kw">in </span>it {
                 new.extend_from_slice(<span class="kw-2">&amp;</span>text[last_match..m.start()]);
                 new.extend_from_slice(<span class="kw-2">&amp;</span>rep);
                 last_match = m.end();
                 <span class="kw">if </span>limit &gt; <span class="number">0 </span>&amp;&amp; i &gt;= limit - <span class="number">1 </span>{
                     <span class="kw">break</span>;
                 }
             }
             new.extend_from_slice(<span class="kw-2">&amp;</span>text[last_match..]);
             <span class="kw">return </span>Cow::Owned(new);
         }

         <span class="comment">// The slower path, which we use if the replacement needs access to
         // capture groups.
         </span><span class="kw">let </span><span class="kw-2">mut </span>it = <span class="self">self</span>.captures_iter(text).enumerate().peekable();
         <span class="kw">if </span>it.peek().is_none() {
             <span class="kw">return </span>Cow::Borrowed(text);
         }
         <span class="kw">let </span><span class="kw-2">mut </span>new = Vec::with_capacity(text.len());
         <span class="kw">let </span><span class="kw-2">mut </span>last_match = <span class="number">0</span>;
         <span class="kw">for </span>(i, cap) <span class="kw">in </span>it {
             <span class="comment">// unwrap on 0 is OK because captures only reports matches
             </span><span class="kw">let </span>m = cap.get(<span class="number">0</span>).unwrap();
             new.extend_from_slice(<span class="kw-2">&amp;</span>text[last_match..m.start()]);
             rep.replace_append(<span class="kw-2">&amp;</span>cap, <span class="kw-2">&amp;mut </span>new);
             last_match = m.end();
             <span class="kw">if </span>limit &gt; <span class="number">0 </span>&amp;&amp; i &gt;= limit - <span class="number">1 </span>{
                 <span class="kw">break</span>;
             }
         }
         new.extend_from_slice(<span class="kw-2">&amp;</span>text[last_match..]);
         Cow::Owned(new)
     }
 }

 <span class="doccomment">/// Advanced or &quot;lower level&quot; search methods.
 </span><span class="kw">impl </span>Regex {
     <span class="doccomment">/// Returns the end location of a match in the text given.
     ///
     /// This method may have the same performance characteristics as
     /// `is_match`, except it provides an end location for a match. In
     /// particular, the location returned *may be shorter* than the proper end
     /// of the leftmost-first match that you would find via `Regex::find`.
     ///
     /// Note that it is not guaranteed that this routine finds the shortest or
     /// &quot;earliest&quot; possible match. Instead, the main idea of this API is that
     /// it returns the offset at the point at which the internal regex engine
     /// has determined that a match has occurred. This may vary depending on
     /// which internal regex engine is used, and thus, the offset itself may
     /// change.
     ///
     /// # Example
     ///
     /// Typically, `a+` would match the entire first sequence of `a` in some
     /// text, but `shortest_match` can give up as soon as it sees the first
     /// `a`.
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// # fn main() {
     /// let text = b&quot;aaaaa&quot;;
     /// let pos = Regex::new(r&quot;a+&quot;).unwrap().shortest_match(text);
     /// assert_eq!(pos, Some(1));
     /// # }
     /// ```
     </span><span class="kw">pub fn </span>shortest_match(<span class="kw-2">&amp;</span><span class="self">self</span>, text: <span class="kw-2">&amp;</span>[u8]) -&gt; <span class="prelude-ty">Option</span>&lt;usize&gt; {
         <span class="self">self</span>.shortest_match_at(text, <span class="number">0</span>)
     }

     <span class="doccomment">/// Returns the same as shortest_match, but starts the search at the given
     /// offset.
     ///
     /// The significance of the starting point is that it takes the surrounding
     /// context into consideration. For example, the `\A` anchor can only
     /// match when `start == 0`.
     </span><span class="kw">pub fn </span>shortest_match_at(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         text: <span class="kw-2">&amp;</span>[u8],
         start: usize,
     ) -&gt; <span class="prelude-ty">Option</span>&lt;usize&gt; {
         <span class="self">self</span>.<span class="number">0</span>.searcher().shortest_match_at(text, start)
     }

     <span class="doccomment">/// Returns the same as is_match, but starts the search at the given
     /// offset.
     ///
     /// The significance of the starting point is that it takes the surrounding
     /// context into consideration. For example, the `\A` anchor can only
     /// match when `start == 0`.
     </span><span class="kw">pub fn </span>is_match_at(<span class="kw-2">&amp;</span><span class="self">self</span>, text: <span class="kw-2">&amp;</span>[u8], start: usize) -&gt; bool {
         <span class="self">self</span>.<span class="number">0</span>.searcher().is_match_at(text, start)
     }

     <span class="doccomment">/// Returns the same as find, but starts the search at the given
     /// offset.
     ///
     /// The significance of the starting point is that it takes the surrounding
     /// context into consideration. For example, the `\A` anchor can only
     /// match when `start == 0`.
     </span><span class="kw">pub fn </span>find_at&lt;<span class="lifetime">&#39;t</span>&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
         start: usize,
     ) -&gt; <span class="prelude-ty">Option</span>&lt;Match&lt;<span class="lifetime">&#39;t</span>&gt;&gt; {
         <span class="self">self</span>.<span class="number">0
             </span>.searcher()
             .find_at(text, start)
             .map(|(s, e)| Match::new(text, s, e))
     }

     <span class="doccomment">/// Returns the same as [`Regex::captures`], but starts the search at the
     /// given offset.
     ///
     /// The significance of the starting point is that it takes the surrounding
     /// context into consideration. For example, the `\A` anchor can only
     /// match when `start == 0`.
     </span><span class="kw">pub fn </span>captures_at&lt;<span class="lifetime">&#39;t</span>&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
         start: usize,
     ) -&gt; <span class="prelude-ty">Option</span>&lt;Captures&lt;<span class="lifetime">&#39;t</span>&gt;&gt; {
         <span class="kw">let </span><span class="kw-2">mut </span>locs = <span class="self">self</span>.capture_locations();
         <span class="self">self</span>.captures_read_at(<span class="kw-2">&amp;mut </span>locs, text, start).map(<span class="kw">move </span>|<span class="kw">_</span>| Captures {
             text,
             locs: locs.<span class="number">0</span>,
             named_groups: <span class="self">self</span>.<span class="number">0</span>.capture_name_idx().clone(),
         })
     }

     <span class="doccomment">/// This is like `captures`, but uses
     /// [`CaptureLocations`](struct.CaptureLocations.html)
     /// instead of
     /// [`Captures`](struct.Captures.html) in order to amortize allocations.
     ///
     /// To create a `CaptureLocations` value, use the
     /// `Regex::capture_locations` method.
     ///
     /// This returns the overall match if this was successful, which is always
     /// equivalence to the `0`th capture group.
     </span><span class="kw">pub fn </span>captures_read&lt;<span class="lifetime">&#39;t</span>&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         locs: <span class="kw-2">&amp;mut </span>CaptureLocations,
         text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
     ) -&gt; <span class="prelude-ty">Option</span>&lt;Match&lt;<span class="lifetime">&#39;t</span>&gt;&gt; {
         <span class="self">self</span>.captures_read_at(locs, text, <span class="number">0</span>)
     }

     <span class="doccomment">/// Returns the same as `captures_read`, but starts the search at the given
     /// offset and populates the capture locations given.
     ///
     /// The significance of the starting point is that it takes the surrounding
     /// context into consideration. For example, the `\A` anchor can only
     /// match when `start == 0`.
     </span><span class="kw">pub fn </span>captures_read_at&lt;<span class="lifetime">&#39;t</span>&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         locs: <span class="kw-2">&amp;mut </span>CaptureLocations,
         text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
         start: usize,
     ) -&gt; <span class="prelude-ty">Option</span>&lt;Match&lt;<span class="lifetime">&#39;t</span>&gt;&gt; {
         <span class="self">self</span>.<span class="number">0
             </span>.searcher()
             .captures_read_at(<span class="kw-2">&amp;mut </span>locs.<span class="number">0</span>, text, start)
             .map(|(s, e)| Match::new(text, s, e))
     }

     <span class="doccomment">/// An undocumented alias for `captures_read_at`.
     ///
     /// The `regex-capi` crate previously used this routine, so to avoid
     /// breaking that crate, we continue to provide the name as an undocumented
     /// alias.
     </span><span class="attribute">#[doc(hidden)]
     </span><span class="kw">pub fn </span>read_captures_at&lt;<span class="lifetime">&#39;t</span>&gt;(
         <span class="kw-2">&amp;</span><span class="self">self</span>,
         locs: <span class="kw-2">&amp;mut </span>CaptureLocations,
         text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
         start: usize,
     ) -&gt; <span class="prelude-ty">Option</span>&lt;Match&lt;<span class="lifetime">&#39;t</span>&gt;&gt; {
         <span class="self">self</span>.captures_read_at(locs, text, start)
     }
 }

 <span class="doccomment">/// Auxiliary methods.
 </span><span class="kw">impl </span>Regex {
     <span class="doccomment">/// Returns the original string of this regex.
     </span><span class="kw">pub fn </span>as_str(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>str {
         <span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>.regex_strings()[<span class="number">0</span>]
     }

     <span class="doccomment">/// Returns an iterator over the capture names.
     </span><span class="kw">pub fn </span>capture_names(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; CaptureNames&lt;<span class="lifetime">&#39;_</span>&gt; {
         CaptureNames(<span class="self">self</span>.<span class="number">0</span>.capture_names().iter())
     }

     <span class="doccomment">/// Returns the number of captures.
     </span><span class="kw">pub fn </span>captures_len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.<span class="number">0</span>.capture_names().len()
     }

     <span class="doccomment">/// Returns the total number of capturing groups that appear in every
     /// possible match.
     ///
     /// If the number of capture groups can vary depending on the match, then
     /// this returns `None`. That is, a value is only returned when the number
     /// of matching groups is invariant or &quot;static.&quot;
     ///
     /// Note that like [`Regex::captures_len`], this **does** include the
     /// implicit capturing group corresponding to the entire match. Therefore,
     /// when a non-None value is returned, it is guaranteed to be at least `1`.
     /// Stated differently, a return value of `Some(0)` is impossible.
     ///
     /// # Example
     ///
     /// This shows a few cases where a static number of capture groups is
     /// available and a few cases where it is not.
     ///
     /// ```
     /// use regex::bytes::Regex;
     ///
     /// let len = |pattern| {
     ///     Regex::new(pattern).map(|re| re.static_captures_len())
     /// };
     ///
     /// assert_eq!(Some(1), len(&quot;a&quot;)?);
     /// assert_eq!(Some(2), len(&quot;(a)&quot;)?);
     /// assert_eq!(Some(2), len(&quot;(a)|(b)&quot;)?);
     /// assert_eq!(Some(3), len(&quot;(a)(b)|(c)(d)&quot;)?);
     /// assert_eq!(None, len(&quot;(a)|b&quot;)?);
     /// assert_eq!(None, len(&quot;a|(b)&quot;)?);
     /// assert_eq!(None, len(&quot;(b)*&quot;)?);
     /// assert_eq!(Some(2), len(&quot;(b)+&quot;)?);
     ///
     /// # Ok::&lt;(), Box&lt;dyn std::error::Error&gt;&gt;(())
     /// ```
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>static_captures_len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;usize&gt; {
         <span class="self">self</span>.<span class="number">0</span>.static_captures_len().map(|len| len.saturating_add(<span class="number">1</span>))
     }

     <span class="doccomment">/// Returns an empty set of capture locations that can be reused in
     /// multiple calls to `captures_read` or `captures_read_at`.
     </span><span class="kw">pub fn </span>capture_locations(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; CaptureLocations {
         CaptureLocations(<span class="self">self</span>.<span class="number">0</span>.searcher().locations())
     }

     <span class="doccomment">/// An alias for `capture_locations` to preserve backward compatibility.
     ///
     /// The `regex-capi` crate uses this method, so to avoid breaking that
     /// crate, we continue to export it as an undocumented API.
     </span><span class="attribute">#[doc(hidden)]
     </span><span class="kw">pub fn </span>locations(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; CaptureLocations {
         CaptureLocations(<span class="self">self</span>.<span class="number">0</span>.searcher().locations())
     }
 }

 <span class="doccomment">/// An iterator over all non-overlapping matches for a particular string.
 ///
 /// The iterator yields a tuple of integers corresponding to the start and end
 /// of the match. The indices are byte offsets. The iterator stops when no more
 /// matches can be found.
 ///
 /// `&#39;r` is the lifetime of the compiled regular expression and `&#39;t` is the
 /// lifetime of the matched byte string.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>Matches&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt;(re_trait::Matches&lt;<span class="lifetime">&#39;t</span>, ExecNoSync&lt;<span class="lifetime">&#39;r</span>&gt;&gt;);

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; Iterator <span class="kw">for </span>Matches&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {
     <span class="kw">type </span>Item = Match&lt;<span class="lifetime">&#39;t</span>&gt;;

     <span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Match&lt;<span class="lifetime">&#39;t</span>&gt;&gt; {
         <span class="kw">let </span>text = <span class="self">self</span>.<span class="number">0</span>.text();
         <span class="self">self</span>.<span class="number">0</span>.next().map(|(s, e)| Match::new(text, s, e))
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; FusedIterator <span class="kw">for </span>Matches&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {}

 <span class="doccomment">/// An iterator that yields all non-overlapping capture groups matching a
 /// particular regular expression.
 ///
 /// The iterator stops when no more matches can be found.
 ///
 /// `&#39;r` is the lifetime of the compiled regular expression and `&#39;t` is the
 /// lifetime of the matched byte string.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>CaptureMatches&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt;(
     re_trait::CaptureMatches&lt;<span class="lifetime">&#39;t</span>, ExecNoSync&lt;<span class="lifetime">&#39;r</span>&gt;&gt;,
 );

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; Iterator <span class="kw">for </span>CaptureMatches&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {
     <span class="kw">type </span>Item = Captures&lt;<span class="lifetime">&#39;t</span>&gt;;

     <span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Captures&lt;<span class="lifetime">&#39;t</span>&gt;&gt; {
         <span class="self">self</span>.<span class="number">0</span>.next().map(|locs| Captures {
             text: <span class="self">self</span>.<span class="number">0</span>.text(),
             locs,
             named_groups: <span class="self">self</span>.<span class="number">0</span>.regex().capture_name_idx().clone(),
         })
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; FusedIterator <span class="kw">for </span>CaptureMatches&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {}

 <span class="doccomment">/// Yields all substrings delimited by a regular expression match.
 ///
 /// `&#39;r` is the lifetime of the compiled regular expression and `&#39;t` is the
 /// lifetime of the byte string being split.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>Split&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {
     finder: Matches&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt;,
     last: usize,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; Iterator <span class="kw">for </span>Split&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {
     <span class="kw">type </span>Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8];

     <span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8]&gt; {
         <span class="kw">let </span>text = <span class="self">self</span>.finder.<span class="number">0</span>.text();
         <span class="kw">match </span><span class="self">self</span>.finder.next() {
             <span class="prelude-val">None </span>=&gt; {
                 <span class="kw">if </span><span class="self">self</span>.last &gt; text.len() {
                     <span class="prelude-val">None
                 </span>} <span class="kw">else </span>{
                     <span class="kw">let </span>s = <span class="kw-2">&amp;</span>text[<span class="self">self</span>.last..];
                     <span class="self">self</span>.last = text.len() + <span class="number">1</span>; <span class="comment">// Next call will return None
                     </span><span class="prelude-val">Some</span>(s)
                 }
             }
             <span class="prelude-val">Some</span>(m) =&gt; {
                 <span class="kw">let </span>matched = <span class="kw-2">&amp;</span>text[<span class="self">self</span>.last..m.start()];
                 <span class="self">self</span>.last = m.end();
                 <span class="prelude-val">Some</span>(matched)
             }
         }
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; FusedIterator <span class="kw">for </span>Split&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {}

 <span class="doccomment">/// Yields at most `N` substrings delimited by a regular expression match.
 ///
 /// The last substring will be whatever remains after splitting.
 ///
 /// `&#39;r` is the lifetime of the compiled regular expression and `&#39;t` is the
 /// lifetime of the byte string being split.
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>SplitN&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {
     splits: Split&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt;,
     n: usize,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; Iterator <span class="kw">for </span>SplitN&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {
     <span class="kw">type </span>Item = <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8];

     <span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8]&gt; {
         <span class="kw">if </span><span class="self">self</span>.n == <span class="number">0 </span>{
             <span class="kw">return </span><span class="prelude-val">None</span>;
         }

         <span class="self">self</span>.n -= <span class="number">1</span>;
         <span class="kw">if </span><span class="self">self</span>.n &gt; <span class="number">0 </span>{
             <span class="kw">return </span><span class="self">self</span>.splits.next();
         }

         <span class="kw">let </span>text = <span class="self">self</span>.splits.finder.<span class="number">0</span>.text();
         <span class="kw">if </span><span class="self">self</span>.splits.last &gt; text.len() {
             <span class="comment">// We&#39;ve already returned all substrings.
             </span><span class="prelude-val">None
         </span>} <span class="kw">else </span>{
             <span class="comment">// self.n == 0, so future calls will return None immediately
             </span><span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span>text[<span class="self">self</span>.splits.last..])
         }
     }

     <span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
         (<span class="number">0</span>, <span class="prelude-val">Some</span>(<span class="self">self</span>.n))
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; FusedIterator <span class="kw">for </span>SplitN&lt;<span class="lifetime">&#39;r</span>, <span class="lifetime">&#39;t</span>&gt; {}

 <span class="doccomment">/// An iterator over the names of all possible captures.
 ///
 /// `None` indicates an unnamed capture; the first element (capture 0, the
 /// whole matched region) is always unnamed.
 ///
 /// `&#39;r` is the lifetime of the compiled regular expression.
 </span><span class="attribute">#[derive(Clone, Debug)]
 </span><span class="kw">pub struct </span>CaptureNames&lt;<span class="lifetime">&#39;r</span>&gt;(::std::slice::Iter&lt;<span class="lifetime">&#39;r</span>, <span class="prelude-ty">Option</span>&lt;String&gt;&gt;);

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;r</span>&gt; Iterator <span class="kw">for </span>CaptureNames&lt;<span class="lifetime">&#39;r</span>&gt; {
     <span class="kw">type </span>Item = <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;r </span>str&gt;;

     <span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;r </span>str&gt;&gt; {
         <span class="self">self</span>.<span class="number">0
             </span>.next()
             .as_ref()
             .map(|slot| slot.as_ref().map(|name| name.as_ref()))
     }

     <span class="kw">fn </span>size_hint(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; (usize, <span class="prelude-ty">Option</span>&lt;usize&gt;) {
         <span class="self">self</span>.<span class="number">0</span>.size_hint()
     }

     <span class="kw">fn </span>count(<span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.<span class="number">0</span>.count()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;r</span>&gt; ExactSizeIterator <span class="kw">for </span>CaptureNames&lt;<span class="lifetime">&#39;r</span>&gt; {}

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;r</span>&gt; FusedIterator <span class="kw">for </span>CaptureNames&lt;<span class="lifetime">&#39;r</span>&gt; {}

 <span class="doccomment">/// CaptureLocations is a low level representation of the raw offsets of each
 /// submatch.
 ///
 /// You can think of this as a lower level
 /// [`Captures`](struct.Captures.html), where this type does not support
 /// named capturing groups directly and it does not borrow the text that these
 /// offsets were matched on.
 ///
 /// Primarily, this type is useful when using the lower level `Regex` APIs
 /// such as `read_captures`, which permits amortizing the allocation in which
 /// capture match locations are stored.
 ///
 /// In order to build a value of this type, you&#39;ll need to call the
 /// `capture_locations` method on the `Regex` being used to execute the search.
 /// The value returned can then be reused in subsequent searches.
 ///
 /// # Example
 ///
 /// This example shows how to create and use `CaptureLocations` in a search.
 ///
 /// ```
 /// use regex::bytes::Regex;
 ///
 /// let re = Regex::new(r&quot;(?&lt;first&gt;\w+)\s+(?&lt;last&gt;\w+)&quot;).unwrap();
 /// let mut locs = re.capture_locations();
 /// let m = re.captures_read(&amp;mut locs, b&quot;Bruce Springsteen&quot;).unwrap();
 /// assert_eq!(0..17, m.range());
 /// assert_eq!(Some((0, 17)), locs.get(0));
 /// assert_eq!(Some((0, 5)), locs.get(1));
 /// assert_eq!(Some((6, 17)), locs.get(2));
 ///
 /// // Asking for an invalid capture group always returns None.
 /// assert_eq!(None, locs.get(3));
 /// assert_eq!(None, locs.get(34973498648));
 /// assert_eq!(None, locs.get(9944060567225171988));
 /// ```
 </span><span class="attribute">#[derive(Clone, Debug)]
 </span><span class="kw">pub struct </span>CaptureLocations(re_trait::Locations);

 <span class="doccomment">/// A type alias for `CaptureLocations` for backwards compatibility.
 ///
 /// Previously, we exported `CaptureLocations` as `Locations` in an
 /// undocumented API. To prevent breaking that code (e.g., in `regex-capi`),
 /// we continue re-exporting the same undocumented API.
 </span><span class="attribute">#[doc(hidden)]
 </span><span class="kw">pub type </span>Locations = CaptureLocations;

 <span class="kw">impl </span>CaptureLocations {
     <span class="doccomment">/// Returns the start and end positions of the Nth capture group. Returns
     /// `None` if `i` is not a valid capture group or if the capture group did
     /// not match anything. The positions returned are *always* byte indices
     /// with respect to the original string matched.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>get(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; <span class="prelude-ty">Option</span>&lt;(usize, usize)&gt; {
         <span class="self">self</span>.<span class="number">0</span>.pos(i)
     }

     <span class="doccomment">/// Returns the total number of capture groups (even if they didn&#39;t match).
     ///
     /// This is always at least `1` since every regex has at least `1`
     /// capturing group that corresponds to the entire match.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.<span class="number">0</span>.len()
     }

     <span class="doccomment">/// An alias for the `get` method for backwards compatibility.
     ///
     /// Previously, we exported `get` as `pos` in an undocumented API. To
     /// prevent breaking that code (e.g., in `regex-capi`), we continue
     /// re-exporting the same undocumented API.
     </span><span class="attribute">#[doc(hidden)]
     #[inline]
     </span><span class="kw">pub fn </span>pos(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; <span class="prelude-ty">Option</span>&lt;(usize, usize)&gt; {
         <span class="self">self</span>.get(i)
     }
 }

 <span class="doccomment">/// Captures represents a group of captured byte strings for a single match.
 ///
 /// The 0th capture always corresponds to the entire match. Each subsequent
 /// index corresponds to the next capture group in the regex. If a capture
 /// group is named, then the matched byte string is *also* available via the
 /// `name` method. (Note that the 0th capture is always unnamed and so must be
 /// accessed with the `get` method.)
 ///
 /// Positions returned from a capture group are always byte indices.
 ///
 /// `&#39;t` is the lifetime of the matched text.
 </span><span class="kw">pub struct </span>Captures&lt;<span class="lifetime">&#39;t</span>&gt; {
     text: <span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8],
     locs: re_trait::Locations,
     named_groups: Arc&lt;HashMap&lt;String, usize&gt;&gt;,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; Captures&lt;<span class="lifetime">&#39;t</span>&gt; {
     <span class="doccomment">/// Returns the match associated with the capture group at index `i`. If
     /// `i` does not correspond to a capture group, or if the capture group
     /// did not participate in the match, then `None` is returned.
     ///
     /// # Examples
     ///
     /// Get the text of the match with a default of an empty string if this
     /// group didn&#39;t participate in the match:
     ///
     /// ```rust
     /// # use regex::bytes::Regex;
     /// let re = Regex::new(r&quot;[a-z]+(?:([0-9]+)|([A-Z]+))&quot;).unwrap();
     /// let caps = re.captures(b&quot;abc123&quot;).unwrap();
     ///
     /// let text1 = caps.get(1).map_or(&amp;b&quot;&quot;[..], |m| m.as_bytes());
     /// let text2 = caps.get(2).map_or(&amp;b&quot;&quot;[..], |m| m.as_bytes());
     /// assert_eq!(text1, &amp;b&quot;123&quot;[..]);
     /// assert_eq!(text2, &amp;b&quot;&quot;[..]);
     /// ```
     </span><span class="kw">pub fn </span>get(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; <span class="prelude-ty">Option</span>&lt;Match&lt;<span class="lifetime">&#39;t</span>&gt;&gt; {
         <span class="self">self</span>.locs.pos(i).map(|(s, e)| Match::new(<span class="self">self</span>.text, s, e))
     }

     <span class="doccomment">/// Returns the match for the capture group named `name`. If `name` isn&#39;t a
     /// valid capture group or didn&#39;t match anything, then `None` is returned.
     </span><span class="kw">pub fn </span>name(<span class="kw-2">&amp;</span><span class="self">self</span>, name: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Option</span>&lt;Match&lt;<span class="lifetime">&#39;t</span>&gt;&gt; {
         <span class="self">self</span>.named_groups.get(name).and_then(|<span class="kw-2">&amp;</span>i| <span class="self">self</span>.get(i))
     }

     <span class="doccomment">/// An iterator that yields all capturing matches in the order in which
     /// they appear in the regex. If a particular capture group didn&#39;t
     /// participate in the match, then `None` is yielded for that capture.
     ///
     /// The first match always corresponds to the overall match of the regex.
     </span><span class="kw">pub fn </span>iter&lt;<span class="lifetime">&#39;c</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;c </span><span class="self">self</span>) -&gt; SubCaptureMatches&lt;<span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>&gt; {
         SubCaptureMatches { caps: <span class="self">self</span>, it: <span class="self">self</span>.locs.iter() }
     }

     <span class="doccomment">/// Expands all instances of `$name` in `replacement` to the corresponding
     /// capture group `name`, and writes them to the `dst` buffer given.
     ///
     /// `name` may be an integer corresponding to the index of the capture
     /// group (counted by order of opening parenthesis where `0` is the
     /// entire match) or it can be a name (consisting of letters, digits or
     /// underscores) corresponding to a named capture group.
     ///
     /// If `name` isn&#39;t a valid capture group (whether the name doesn&#39;t exist
     /// or isn&#39;t a valid index), then it is replaced with the empty string.
     ///
     /// The longest possible name consisting of the characters `[_0-9A-Za-z]`
     /// is used. e.g., `$1a` looks up the capture group named `1a` and not the
     /// capture group at index `1`. To exert more precise control over the
     /// name, or to refer to a capture group name that uses characters outside
     /// of `[_0-9A-Za-z]`, use braces, e.g., `${1}a` or `${foo[bar].baz}`. When
     /// using braces, any sequence of valid UTF-8 bytes is permitted. If the
     /// sequence does not refer to a capture group name in the corresponding
     /// regex, then it is replaced with an empty string.
     ///
     /// To write a literal `$` use `$$`.
     </span><span class="kw">pub fn </span>expand(<span class="kw-2">&amp;</span><span class="self">self</span>, replacement: <span class="kw-2">&amp;</span>[u8], dst: <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt;) {
         expand_bytes(<span class="self">self</span>, replacement, dst)
     }

     <span class="doccomment">/// Returns the total number of capture groups (even if they didn&#39;t match).
     ///
     /// This is always at least `1`, since every regex has at least one capture
     /// group that corresponds to the full match.
     </span><span class="attribute">#[inline]
     </span><span class="kw">pub fn </span>len(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
         <span class="self">self</span>.locs.len()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; fmt::Debug <span class="kw">for </span>Captures&lt;<span class="lifetime">&#39;t</span>&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         f.debug_tuple(<span class="string">&quot;Captures&quot;</span>).field(<span class="kw-2">&amp;</span>CapturesDebug(<span class="self">self</span>)).finish()
     }
 }

 <span class="kw">struct </span>CapturesDebug&lt;<span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;c </span>Captures&lt;<span class="lifetime">&#39;t</span>&gt;);

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>&gt; fmt::Debug <span class="kw">for </span>CapturesDebug&lt;<span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>&gt; {
     <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
         <span class="kw">fn </span>escape_bytes(bytes: <span class="kw-2">&amp;</span>[u8]) -&gt; String {
             <span class="kw">let </span><span class="kw-2">mut </span>s = String::new();
             <span class="kw">for </span><span class="kw-2">&amp;</span>b <span class="kw">in </span>bytes {
                 s.push_str(<span class="kw-2">&amp;</span>escape_byte(b));
             }
             s
         }

         <span class="kw">fn </span>escape_byte(byte: u8) -&gt; String {
             <span class="kw">use </span>std::ascii::escape_default;

             <span class="kw">let </span>escaped: Vec&lt;u8&gt; = escape_default(byte).collect();
             String::from_utf8_lossy(<span class="kw-2">&amp;</span>escaped).into_owned()
         }

         <span class="comment">// We&#39;d like to show something nice here, even if it means an
         // allocation to build a reverse index.
         </span><span class="kw">let </span>slot_to_name: HashMap&lt;<span class="kw-2">&amp;</span>usize, <span class="kw-2">&amp;</span>String&gt; =
             <span class="self">self</span>.<span class="number">0</span>.named_groups.iter().map(|(a, b)| (b, a)).collect();
         <span class="kw">let </span><span class="kw-2">mut </span>map = f.debug_map();
         <span class="kw">for </span>(slot, m) <span class="kw">in </span><span class="self">self</span>.<span class="number">0</span>.locs.iter().enumerate() {
             <span class="kw">let </span>m = m.map(|(s, e)| escape_bytes(<span class="kw-2">&amp;</span><span class="self">self</span>.<span class="number">0</span>.text[s..e]));
             <span class="kw">if let </span><span class="prelude-val">Some</span>(name) = slot_to_name.get(<span class="kw-2">&amp;</span>slot) {
                 map.entry(<span class="kw-2">&amp;</span>name, <span class="kw-2">&amp;</span>m);
             } <span class="kw">else </span>{
                 map.entry(<span class="kw-2">&amp;</span>slot, <span class="kw-2">&amp;</span>m);
             }
         }
         map.finish()
     }
 }

 <span class="doccomment">/// Get a group by index.
 ///
 /// `&#39;t` is the lifetime of the matched text.
 ///
 /// The text can&#39;t outlive the `Captures` object if this method is
 /// used, because of how `Index` is defined (normally `a[i]` is part
 /// of `a` and can&#39;t outlive it); to do that, use `get()` instead.
 ///
 /// # Panics
 ///
 /// If there is no group at the given index.
 </span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; Index&lt;usize&gt; <span class="kw">for </span>Captures&lt;<span class="lifetime">&#39;t</span>&gt; {
     <span class="kw">type </span>Output = [u8];

     <span class="kw">fn </span>index(<span class="kw-2">&amp;</span><span class="self">self</span>, i: usize) -&gt; <span class="kw-2">&amp;</span>[u8] {
         <span class="self">self</span>.get(i)
             .map(|m| m.as_bytes())
             .unwrap_or_else(|| <span class="macro">panic!</span>(<span class="string">&quot;no group at index &#39;{}&#39;&quot;</span>, i))
     }
 }

 <span class="doccomment">/// Get a group by name.
 ///
 /// `&#39;t` is the lifetime of the matched text and `&#39;i` is the lifetime
 /// of the group name (the index).
 ///
 /// The text can&#39;t outlive the `Captures` object if this method is
 /// used, because of how `Index` is defined (normally `a[i]` is part
 /// of `a` and can&#39;t outlive it); to do that, use `name` instead.
 ///
 /// # Panics
 ///
 /// If there is no group named by the given value.
 </span><span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>, <span class="lifetime">&#39;i</span>&gt; Index&lt;<span class="kw-2">&amp;</span><span class="lifetime">&#39;i </span>str&gt; <span class="kw">for </span>Captures&lt;<span class="lifetime">&#39;t</span>&gt; {
     <span class="kw">type </span>Output = [u8];

     <span class="kw">fn </span>index&lt;<span class="lifetime">&#39;a</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="self">self</span>, name: <span class="kw-2">&amp;</span><span class="lifetime">&#39;i </span>str) -&gt; <span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[u8] {
         <span class="self">self</span>.name(name)
             .map(|m| m.as_bytes())
             .unwrap_or_else(|| <span class="macro">panic!</span>(<span class="string">&quot;no group named &#39;{}&#39;&quot;</span>, name))
     }
 }

 <span class="doccomment">/// An iterator that yields all capturing matches in the order in which they
 /// appear in the regex.
 ///
 /// If a particular capture group didn&#39;t participate in the match, then `None`
 /// is yielded for that capture. The first match always corresponds to the
 /// overall match of the regex.
 ///
 /// The lifetime `&#39;c` corresponds to the lifetime of the `Captures` value, and
 /// the lifetime `&#39;t` corresponds to the originally matched text.
 </span><span class="attribute">#[derive(Clone, Debug)]
 </span><span class="kw">pub struct </span>SubCaptureMatches&lt;<span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>&gt; {
     caps: <span class="kw-2">&amp;</span><span class="lifetime">&#39;c </span>Captures&lt;<span class="lifetime">&#39;t</span>&gt;,
     it: SubCapturesPosIter&lt;<span class="lifetime">&#39;c</span>&gt;,
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>&gt; Iterator <span class="kw">for </span>SubCaptureMatches&lt;<span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>&gt; {
     <span class="kw">type </span>Item = <span class="prelude-ty">Option</span>&lt;Match&lt;<span class="lifetime">&#39;t</span>&gt;&gt;;

     <span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="prelude-ty">Option</span>&lt;Match&lt;<span class="lifetime">&#39;t</span>&gt;&gt;&gt; {
         <span class="self">self</span>.it
             .next()
             .map(|cap| cap.map(|(s, e)| Match::new(<span class="self">self</span>.caps.text, s, e)))
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>&gt; FusedIterator <span class="kw">for </span>SubCaptureMatches&lt;<span class="lifetime">&#39;c</span>, <span class="lifetime">&#39;t</span>&gt; {}

 <span class="doccomment">/// Replacer describes types that can be used to replace matches in a byte
 /// string.
 ///
 /// In general, users of this crate shouldn&#39;t need to implement this trait,
 /// since implementations are already provided for `&amp;[u8]` along with other
 /// variants of bytes types and `FnMut(&amp;Captures) -&gt; Vec&lt;u8&gt;` (or any
 /// `FnMut(&amp;Captures) -&gt; T` where `T: AsRef&lt;[u8]&gt;`), which covers most use cases.
 </span><span class="kw">pub trait </span>Replacer {
     <span class="doccomment">/// Appends text to `dst` to replace the current match.
     ///
     /// The current match is represented by `caps`, which is guaranteed to
     /// have a match at capture group `0`.
     ///
     /// For example, a no-op replacement would be
     /// `dst.extend(&amp;caps[0])`.
     </span><span class="kw">fn </span>replace_append(<span class="kw-2">&amp;mut </span><span class="self">self</span>, caps: <span class="kw-2">&amp;</span>Captures&lt;<span class="lifetime">&#39;_</span>&gt;, dst: <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt;);

     <span class="doccomment">/// Return a fixed unchanging replacement byte string.
     ///
     /// When doing replacements, if access to `Captures` is not needed (e.g.,
     /// the replacement byte string does not need `$` expansion), then it can
     /// be beneficial to avoid finding sub-captures.
     ///
     /// In general, this is called once for every call to `replacen`.
     </span><span class="kw">fn </span>no_expansion&lt;<span class="lifetime">&#39;r</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;r </span><span class="kw-2">mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Cow&lt;<span class="lifetime">&#39;r</span>, [u8]&gt;&gt; {
         <span class="prelude-val">None
     </span>}

     <span class="doccomment">/// Return a `Replacer` that borrows and wraps this `Replacer`.
     ///
     /// This is useful when you want to take a generic `Replacer` (which might
     /// not be cloneable) and use it without consuming it, so it can be used
     /// more than once.
     ///
     /// # Example
     ///
     /// ```
     /// use regex::bytes::{Regex, Replacer};
     ///
     /// fn replace_all_twice&lt;R: Replacer&gt;(
     ///     re: Regex,
     ///     src: &amp;[u8],
     ///     mut rep: R,
     /// ) -&gt; Vec&lt;u8&gt; {
     ///     let dst = re.replace_all(src, rep.by_ref());
     ///     let dst = re.replace_all(&amp;dst, rep.by_ref());
     ///     dst.into_owned()
     /// }
     /// ```
     </span><span class="kw">fn </span>by_ref&lt;<span class="lifetime">&#39;r</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;r </span><span class="kw-2">mut </span><span class="self">self</span>) -&gt; ReplacerRef&lt;<span class="lifetime">&#39;r</span>, <span class="self">Self</span>&gt; {
         ReplacerRef(<span class="self">self</span>)
     }
 }

 <span class="doccomment">/// By-reference adaptor for a `Replacer`
 ///
 /// Returned by [`Replacer::by_ref`](trait.Replacer.html#method.by_ref).
 </span><span class="attribute">#[derive(Debug)]
 </span><span class="kw">pub struct </span>ReplacerRef&lt;<span class="lifetime">&#39;a</span>, R: <span class="question-mark">?</span>Sized&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span><span class="kw-2">mut </span>R);

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>, R: Replacer + <span class="question-mark">?</span>Sized + <span class="lifetime">&#39;a</span>&gt; Replacer <span class="kw">for </span>ReplacerRef&lt;<span class="lifetime">&#39;a</span>, R&gt; {
     <span class="kw">fn </span>replace_append(<span class="kw-2">&amp;mut </span><span class="self">self</span>, caps: <span class="kw-2">&amp;</span>Captures&lt;<span class="lifetime">&#39;_</span>&gt;, dst: <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt;) {
         <span class="self">self</span>.<span class="number">0</span>.replace_append(caps, dst)
     }
     <span class="kw">fn </span>no_expansion&lt;<span class="lifetime">&#39;r</span>&gt;(<span class="kw-2">&amp;</span><span class="lifetime">&#39;r </span><span class="kw-2">mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Cow&lt;<span class="lifetime">&#39;r</span>, [u8]&gt;&gt; {
         <span class="self">self</span>.<span class="number">0</span>.no_expansion()
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Replacer <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>[u8] {
     <span class="kw">fn </span>replace_append(<span class="kw-2">&amp;mut </span><span class="self">self</span>, caps: <span class="kw-2">&amp;</span>Captures&lt;<span class="lifetime">&#39;_</span>&gt;, dst: <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt;) {
         caps.expand(<span class="kw-2">*</span><span class="self">self</span>, dst);
     }

     <span class="kw">fn </span>no_expansion(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Cow&lt;<span class="lifetime">&#39;_</span>, [u8]&gt;&gt; {
         no_expansion(<span class="self">self</span>)
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Replacer <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Vec&lt;u8&gt; {
     <span class="kw">fn </span>replace_append(<span class="kw-2">&amp;mut </span><span class="self">self</span>, caps: <span class="kw-2">&amp;</span>Captures&lt;<span class="lifetime">&#39;_</span>&gt;, dst: <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt;) {
         caps.expand(<span class="kw-2">*</span><span class="self">self</span>, dst);
     }

     <span class="kw">fn </span>no_expansion(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Cow&lt;<span class="lifetime">&#39;_</span>, [u8]&gt;&gt; {
         no_expansion(<span class="self">self</span>)
     }
 }

 <span class="kw">impl </span>Replacer <span class="kw">for </span>Vec&lt;u8&gt; {
     <span class="kw">fn </span>replace_append(<span class="kw-2">&amp;mut </span><span class="self">self</span>, caps: <span class="kw-2">&amp;</span>Captures&lt;<span class="lifetime">&#39;_</span>&gt;, dst: <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt;) {
         caps.expand(<span class="self">self</span>, dst);
     }

     <span class="kw">fn </span>no_expansion(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Cow&lt;<span class="lifetime">&#39;_</span>, [u8]&gt;&gt; {
         no_expansion(<span class="self">self</span>)
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Replacer <span class="kw">for </span>Cow&lt;<span class="lifetime">&#39;a</span>, [u8]&gt; {
     <span class="kw">fn </span>replace_append(<span class="kw-2">&amp;mut </span><span class="self">self</span>, caps: <span class="kw-2">&amp;</span>Captures&lt;<span class="lifetime">&#39;_</span>&gt;, dst: <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt;) {
         caps.expand(<span class="self">self</span>.as_ref(), dst);
     }

     <span class="kw">fn </span>no_expansion(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Cow&lt;<span class="lifetime">&#39;_</span>, [u8]&gt;&gt; {
         no_expansion(<span class="self">self</span>)
     }
 }

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;a</span>&gt; Replacer <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;a </span>Cow&lt;<span class="lifetime">&#39;a</span>, [u8]&gt; {
     <span class="kw">fn </span>replace_append(<span class="kw-2">&amp;mut </span><span class="self">self</span>, caps: <span class="kw-2">&amp;</span>Captures&lt;<span class="lifetime">&#39;_</span>&gt;, dst: <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt;) {
         caps.expand(<span class="self">self</span>.as_ref(), dst);
     }

     <span class="kw">fn </span>no_expansion(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Cow&lt;<span class="lifetime">&#39;_</span>, [u8]&gt;&gt; {
         no_expansion(<span class="self">self</span>)
     }
 }

 <span class="kw">fn </span>no_expansion&lt;T: AsRef&lt;[u8]&gt;&gt;(t: <span class="kw-2">&amp;</span>T) -&gt; <span class="prelude-ty">Option</span>&lt;Cow&lt;<span class="lifetime">&#39;_</span>, [u8]&gt;&gt; {
     <span class="kw">let </span>s = t.as_ref();
     <span class="kw">match </span>find_byte(<span class="string">b&#39;$&#39;</span>, s) {
         <span class="prelude-val">Some</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">None</span>,
         <span class="prelude-val">None </span>=&gt; <span class="prelude-val">Some</span>(Cow::Borrowed(s)),
     }
 }

 <span class="kw">impl</span>&lt;F, T&gt; Replacer <span class="kw">for </span>F
 <span class="kw">where
     </span>F: FnMut(<span class="kw-2">&amp;</span>Captures&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; T,
     T: AsRef&lt;[u8]&gt;,
 {
     <span class="kw">fn </span>replace_append(<span class="kw-2">&amp;mut </span><span class="self">self</span>, caps: <span class="kw-2">&amp;</span>Captures&lt;<span class="lifetime">&#39;_</span>&gt;, dst: <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt;) {
         dst.extend_from_slice((<span class="kw-2">*</span><span class="self">self</span>)(caps).as_ref());
     }
 }

 <span class="doccomment">/// `NoExpand` indicates literal byte string replacement.
 ///
 /// It can be used with `replace` and `replace_all` to do a literal byte string
 /// replacement without expanding `$name` to their corresponding capture
 /// groups. This can be both convenient (to avoid escaping `$`, for example)
 /// and performant (since capture groups don&#39;t need to be found).
 ///
 /// `&#39;t` is the lifetime of the literal text.
 </span><span class="attribute">#[derive(Clone, Debug)]
 </span><span class="kw">pub struct </span>NoExpand&lt;<span class="lifetime">&#39;t</span>&gt;(<span class="kw">pub </span><span class="kw-2">&amp;</span><span class="lifetime">&#39;t </span>[u8]);

 <span class="kw">impl</span>&lt;<span class="lifetime">&#39;t</span>&gt; Replacer <span class="kw">for </span>NoExpand&lt;<span class="lifetime">&#39;t</span>&gt; {
     <span class="kw">fn </span>replace_append(<span class="kw-2">&amp;mut </span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&amp;</span>Captures&lt;<span class="lifetime">&#39;_</span>&gt;, dst: <span class="kw-2">&amp;mut </span>Vec&lt;u8&gt;) {
         dst.extend_from_slice(<span class="self">self</span>.<span class="number">0</span>);
     }

     <span class="kw">fn </span>no_expansion(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;Cow&lt;<span class="lifetime">&#39;_</span>, [u8]&gt;&gt; {
         <span class="prelude-val">Some</span>(Cow::Borrowed(<span class="self">self</span>.<span class="number">0</span>))
     }
 }
 </code></pre></div>
 </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="regex" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html>