| <!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="Returns a reverse iterator over all non-overlapping occurrences of a substring in a haystack."><meta name="keywords" content="rust, rustlang, rust-lang, rfind_iter"><title>rfind_iter in memchr::memmem - Rust</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 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class="sidebar-menu-toggle">☰</button><a class="sidebar-logo" href="../../memchr/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><h2></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../../memchr/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2><a href="index.html">In memchr::memmem</a></h2></div></nav><main><div class="width-limiter"><nav class="sub"><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="main-heading"><h1 class="fqn">Function <a href="../index.html">memchr</a>::<wbr><a href="index.html">memmem</a>::<wbr><a class="fn" href="#">rfind_iter</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../../clipboard.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="srclink" href="../../src/memchr/memmem/mod.rs.html#224-229">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="item-decl"><pre class="rust fn"><code>pub fn rfind_iter<'h, 'n, N: 'n + ?<a class="trait" href="https://doc.rust-lang.org/nightly/core/marker/trait.Sized.html" title="trait core::marker::Sized">Sized</a> + <a class="trait" href="https://doc.rust-lang.org/nightly/core/convert/trait.AsRef.html" title="trait core::convert::AsRef">AsRef</a><[<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>]>>(<br> haystack: &'h [<a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.u8.html">u8</a>],<br> needle: <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.reference.html">&'n </a>N<br>) -> <a class="struct" href="struct.FindRevIter.html" title="struct memchr::memmem::FindRevIter">FindRevIter</a><'h, 'n><span class="notable-traits"><span class="notable-traits-tooltip">ⓘ<span class="notable-traits-tooltiptext"><span class="docblock"><span class="notable">Notable traits for <a class="struct" href="struct.FindRevIter.html" title="struct memchr::memmem::FindRevIter">FindRevIter</a><'h, 'n></span><code class="content"><span class="where fmt-newline">impl<'h, 'n> <a class="trait" href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html" title="trait core::iter::traits::iterator::Iterator">Iterator</a> for <a class="struct" href="struct.FindRevIter.html" title="struct memchr::memmem::FindRevIter">FindRevIter</a><'h, 'n></span><span class="where fmt-newline"> type <a href="https://doc.rust-lang.org/nightly/core/iter/traits/iterator/trait.Iterator.html#associatedtype.Item" class="associatedtype">Item</a> = <a class="primitive" href="https://doc.rust-lang.org/nightly/std/primitive.usize.html">usize</a>;</span></code></span></span></span></span></code></pre></div><details class="rustdoc-toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Returns a reverse iterator over all non-overlapping occurrences of a |
| substring in a haystack.</p> |
| <h2 id="complexity"><a href="#complexity">Complexity</a></h2> |
| <p>This routine is guaranteed to have worst case linear time complexity |
| with respect to both the needle and the haystack. That is, this runs |
| in <code>O(needle.len() + haystack.len())</code> time.</p> |
| <p>This routine is also guaranteed to have worst case constant space |
| complexity.</p> |
| <h2 id="examples"><a href="#examples">Examples</a></h2> |
| <p>Basic usage:</p> |
| |
| <div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>memchr::memmem; |
| |
| <span class="kw">let </span>haystack = <span class="string">b"foo bar foo baz foo"</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>it = memmem::rfind_iter(haystack, <span class="string">b"foo"</span>); |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">16</span>), it.next()); |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">8</span>), it.next()); |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">Some</span>(<span class="number">0</span>), it.next()); |
| <span class="macro">assert_eq!</span>(<span class="prelude-val">None</span>, it.next());</code></pre></div> |
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