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class="header-anchor">#</a> String Processing</h1> <h2 id="regexmatch"><a href="#regexmatch" class="header-anchor">#</a> RegexMatch</h2> <h3 id="usage"><a href="#usage" class="header-anchor">#</a> Usage</h3> <p>The function is used to fetch matched contents from text with given regular expression.</p> <p><strong>Name:</strong> REGEXMATCH</p> <p><strong>Input Series:</strong> Only support a single input series. The data type is TEXT.</p> <p><strong>Parameter:</strong></p> <ul><li><code>regex</code>: The regular expression to match in the text. All grammars supported by Java are acceptable,
for example, <code>\d+\.\d+\.\d+\.\d+</code> is expected to match any IPv4 addresses.</li> <li><code>group</code>: The wanted group index in the matched result.
Reference to java.util.regex, group 0 is the whole pattern and
the next ones are numbered with the appearance order of left parentheses.
For example, the groups in <code>A(B(CD))</code> are: 0-<code>A(B(CD))</code>, 1-<code>B(CD)</code>, 2-<code>CD</code>.</li></ul> <p><strong>Output Series:</strong> Output a single series. The type is TEXT.</p> <p><strong>Note:</strong> Those points with null values or not matched with the given pattern will not return any results.</p> <h3 id="examples"><a href="#examples" class="header-anchor">#</a> Examples</h3> <p>Input series:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-------------------------------+
|                         Time|                root.test.d1.s1|
+-----------------------------+-------------------------------+
|2021-01-01T00:00:01.000+08:00|        [192.168.0.1] [SUCCESS]|
|2021-01-01T00:00:02.000+08:00|       [192.168.0.24] [SUCCESS]|
|2021-01-01T00:00:03.000+08:00|           [192.168.0.2] [FAIL]|
|2021-01-01T00:00:04.000+08:00|        [192.168.0.5] [SUCCESS]|
|2021-01-01T00:00:05.000+08:00|      [192.168.0.124] [SUCCESS]|
+-----------------------------+-------------------------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>SQL for query:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> regexmatch<span class="token punctuation">(</span>s1<span class="token punctuation">,</span> <span class="token string">&quot;regex&quot;</span><span class="token operator">=</span><span class="token string">&quot;\d+\.\d+\.\d+\.\d+&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;group&quot;</span><span class="token operator">=</span><span class="token string">&quot;0&quot;</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>d1
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Output series:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+----------------------------------------------------------------------+
|                         Time|regexmatch(root.test.d1.s1, &quot;regex&quot;=&quot;\d+\.\d+\.\d+\.\d+&quot;, &quot;group&quot;=&quot;0&quot;)|
+-----------------------------+----------------------------------------------------------------------+
|2021-01-01T00:00:01.000+08:00|                                                           192.168.0.1|
|2021-01-01T00:00:02.000+08:00|                                                          192.168.0.24|
|2021-01-01T00:00:03.000+08:00|                                                           192.168.0.2|
|2021-01-01T00:00:04.000+08:00|                                                           192.168.0.5|
|2021-01-01T00:00:05.000+08:00|                                                         192.168.0.124|
+-----------------------------+----------------------------------------------------------------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><h2 id="regexreplace"><a href="#regexreplace" class="header-anchor">#</a> RegexReplace</h2> <h3 id="usage-2"><a href="#usage-2" class="header-anchor">#</a> Usage</h3> <p>The function is used to replace the specific regular expression matches with given string.</p> <p><strong>Name:</strong> REGEXREPLACE</p> <p><strong>Input Series:</strong> Only support a single input series. The data type is TEXT.</p> <p><strong>Parameter:</strong></p> <ul><li><code>regex</code>: The target regular expression to be replaced. All grammars supported by Java are acceptable.</li> <li><code>replace</code>: The string to be put on and back reference notes in Java is also supported,
for example, '$1' refers to group 1 in the <code>regex</code> which will be filled with corresponding matched results.</li> <li><code>limit</code>: The number of matches to be replaced which should be an integer no less than -1,
default to -1 which means all matches will be replaced.</li> <li><code>offset</code>: The number of matches to be skipped, which means the first <code>offset</code> matches will not be replaced, default to 0.</li> <li><code>reverse</code>: Whether to count all the matches reversely, default to 'false'.</li></ul> <p><strong>Output Series:</strong> Output a single series. The type is TEXT.</p> <h3 id="examples-2"><a href="#examples-2" class="header-anchor">#</a> Examples</h3> <p>Input series:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-------------------------------+
|                         Time|                root.test.d1.s1|
+-----------------------------+-------------------------------+
|2021-01-01T00:00:01.000+08:00|        [192.168.0.1] [SUCCESS]|
|2021-01-01T00:00:02.000+08:00|       [192.168.0.24] [SUCCESS]|
|2021-01-01T00:00:03.000+08:00|           [192.168.0.2] [FAIL]|
|2021-01-01T00:00:04.000+08:00|        [192.168.0.5] [SUCCESS]|
|2021-01-01T00:00:05.000+08:00|      [192.168.0.124] [SUCCESS]|
+-----------------------------+-------------------------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>SQL for query:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> regexreplace<span class="token punctuation">(</span>s1<span class="token punctuation">,</span> <span class="token string">&quot;regex&quot;</span><span class="token operator">=</span><span class="token string">&quot;192\.168\.0\.(\d+)&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;replace&quot;</span><span class="token operator">=</span><span class="token string">&quot;cluster-$1&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;limit&quot;</span><span class="token operator">=</span><span class="token string">&quot;1&quot;</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>d1
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Output series:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-----------------------------------------------------------+
|                         Time|regexreplace(root.test.d1.s1, &quot;regex&quot;=&quot;192\.168\.0\.(\d+)&quot;,|
|                             |                       &quot;replace&quot;=&quot;cluster-$1&quot;, &quot;limit&quot;=&quot;1&quot;)|
+-----------------------------+-----------------------------------------------------------+
|2021-01-01T00:00:01.000+08:00|                                      [cluster-1] [SUCCESS]|
|2021-01-01T00:00:02.000+08:00|                                     [cluster-24] [SUCCESS]|
|2021-01-01T00:00:03.000+08:00|                                         [cluster-2] [FAIL]|
|2021-01-01T00:00:04.000+08:00|                                      [cluster-5] [SUCCESS]|
|2021-01-01T00:00:05.000+08:00|                                    [cluster-124] [SUCCESS]|
+-----------------------------+-----------------------------------------------------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><h2 id="regexsplit"><a href="#regexsplit" class="header-anchor">#</a> RegexSplit</h2> <h3 id="usage-3"><a href="#usage-3" class="header-anchor">#</a> Usage</h3> <p>The function is used to split text with given regular expression and return specific element.</p> <p><strong>Name:</strong> REGEXSPLIT</p> <p><strong>Input Series:</strong> Only support a single input series. The data type is TEXT.</p> <p><strong>Parameter:</strong></p> <ul><li><code>regex</code>: The regular expression used to split the text.
All grammars supported by Java are acceptable, for example, <code>['&quot;]</code> is expected to match <code>'</code> and <code>&quot;</code>.</li> <li><code>index</code>: The wanted index of elements in the split result.
It should be an integer no less than -1, default to -1 which means the length of the result array is returned
and any non-negative integer is used to fetch the text of the specific index starting from 0.</li></ul> <p><strong>Output Series:</strong> Output a single series. The type is INT32 when <code>index</code> is -1 and TEXT when it's an valid index.</p> <p><strong>Note:</strong> When <code>index</code> is out of the range of the result array, for example <code>0,1,2</code> split with <code>,</code> and <code>index</code> is set to 3,
no result are returned for that record.</p> <h3 id="examples-3"><a href="#examples-3" class="header-anchor">#</a> Examples</h3> <p>Input series:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+---------------+
|                         Time|root.test.d1.s1|
+-----------------------------+---------------+
|2021-01-01T00:00:01.000+08:00|      A,B,A+,B-|
|2021-01-01T00:00:02.000+08:00|      A,A+,A,B+|
|2021-01-01T00:00:03.000+08:00|         B+,B,B|
|2021-01-01T00:00:04.000+08:00|      A+,A,A+,A|
|2021-01-01T00:00:05.000+08:00|       A,B-,B,B|
+-----------------------------+---------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>SQL for query:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> regexsplit<span class="token punctuation">(</span>s1<span class="token punctuation">,</span> <span class="token string">&quot;regex&quot;</span><span class="token operator">=</span><span class="token string">&quot;,&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;index&quot;</span><span class="token operator">=</span><span class="token string">&quot;-1&quot;</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>d1
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Output series:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+------------------------------------------------------+
|                         Time|regexsplit(root.test.d1.s1, &quot;regex&quot;=&quot;,&quot;, &quot;index&quot;=&quot;-1&quot;)|
+-----------------------------+------------------------------------------------------+
|2021-01-01T00:00:01.000+08:00|                                                     4|
|2021-01-01T00:00:02.000+08:00|                                                     4|
|2021-01-01T00:00:03.000+08:00|                                                     3|
|2021-01-01T00:00:04.000+08:00|                                                     4|
|2021-01-01T00:00:05.000+08:00|                                                     4|
+-----------------------------+------------------------------------------------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>Another SQL for query:</p> <p>SQL for query:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> regexsplit<span class="token punctuation">(</span>s1<span class="token punctuation">,</span> <span class="token string">&quot;regex&quot;</span><span class="token operator">=</span><span class="token string">&quot;,&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;index&quot;</span><span class="token operator">=</span><span class="token string">&quot;3&quot;</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>d1
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Output series:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-----------------------------------------------------+
|                         Time|regexsplit(root.test.d1.s1, &quot;regex&quot;=&quot;,&quot;, &quot;index&quot;=&quot;3&quot;)|
+-----------------------------+-----------------------------------------------------+
|2021-01-01T00:00:01.000+08:00|                                                   B-|
|2021-01-01T00:00:02.000+08:00|                                                   B+|
|2021-01-01T00:00:04.000+08:00|                                                    A|
|2021-01-01T00:00:05.000+08:00|                                                    B|
+-----------------------------+-----------------------------------------------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br></div></div><h2 id="strreplace"><a href="#strreplace" class="header-anchor">#</a> StrReplace</h2> <h3 id="usage-4"><a href="#usage-4" class="header-anchor">#</a> Usage</h3> <p>The function is used to replace the specific substring with given string.</p> <p><strong>Name:</strong> STRREPLACE</p> <p><strong>Input Series:</strong> Only support a single input series. The data type is TEXT.</p> <p><strong>Parameter:</strong></p> <ul><li><code>target</code>: The target substring to be replaced.</li> <li><code>replace</code>: The string to be put on.</li> <li><code>limit</code>: The number of matches to be replaced which should be an integer no less than -1,
default to -1 which means all matches will be replaced.</li> <li><code>offset</code>: The number of matches to be skipped, which means the first <code>offset</code> matches will not be replaced, default to 0.</li> <li><code>reverse</code>: Whether to count all the matches reversely, default to 'false'.</li></ul> <p><strong>Output Series:</strong> Output a single series. The type is TEXT.</p> <h3 id="examples-4"><a href="#examples-4" class="header-anchor">#</a> Examples</h3> <p>Input series:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+---------------+
|                         Time|root.test.d1.s1|
+-----------------------------+---------------+
|2021-01-01T00:00:01.000+08:00|      A,B,A+,B-|
|2021-01-01T00:00:02.000+08:00|      A,A+,A,B+|
|2021-01-01T00:00:03.000+08:00|         B+,B,B|
|2021-01-01T00:00:04.000+08:00|      A+,A,A+,A|
|2021-01-01T00:00:05.000+08:00|       A,B-,B,B|
+-----------------------------+---------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>SQL for query:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> strreplace<span class="token punctuation">(</span>s1<span class="token punctuation">,</span> <span class="token string">&quot;target&quot;</span><span class="token operator">=</span><span class="token string">&quot;,&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;replace&quot;</span><span class="token operator">=</span><span class="token string">&quot;/&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;limit&quot;</span><span class="token operator">=</span><span class="token string">&quot;2&quot;</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>d1
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Output series:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-----------------------------------------+
|                         Time|strreplace(root.test.d1.s1, &quot;target&quot;=&quot;,&quot;,|
|                             |              &quot;replace&quot;=&quot;/&quot;, &quot;limit&quot;=&quot;2&quot;)|
+-----------------------------+-----------------------------------------+
|2021-01-01T00:00:01.000+08:00|                                A/B/A+,B-|
|2021-01-01T00:00:02.000+08:00|                                A/A+/A,B+|
|2021-01-01T00:00:03.000+08:00|                                   B+/B/B|
|2021-01-01T00:00:04.000+08:00|                                A+/A/A+,A|
|2021-01-01T00:00:05.000+08:00|                                 A/B-/B,B|
+-----------------------------+-----------------------------------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div><p>Another SQL for query:</p> <div class="language-sql line-numbers-mode"><pre class="language-sql"><code><span class="token keyword">select</span> strreplace<span class="token punctuation">(</span>s1<span class="token punctuation">,</span> <span class="token string">&quot;target&quot;</span><span class="token operator">=</span><span class="token string">&quot;,&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;replace&quot;</span><span class="token operator">=</span><span class="token string">&quot;/&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;limit&quot;</span><span class="token operator">=</span><span class="token string">&quot;1&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;offset&quot;</span><span class="token operator">=</span><span class="token string">&quot;1&quot;</span><span class="token punctuation">,</span> <span class="token string">&quot;reverse&quot;</span><span class="token operator">=</span><span class="token string">&quot;true&quot;</span><span class="token punctuation">)</span> <span class="token keyword">from</span> root<span class="token punctuation">.</span>test<span class="token punctuation">.</span>d1
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br></div></div><p>Output series:</p> <div class="language- line-numbers-mode"><pre class="language-text"><code>+-----------------------------+-----------------------------------------------------+
|                         Time|strreplace(root.test.d1.s1, &quot;target&quot;=&quot;,&quot;, &quot;replace&quot;= | 
|                             |    &quot;|&quot;, &quot;limit&quot;=&quot;1&quot;, &quot;offset&quot;=&quot;1&quot;, &quot;reverse&quot;=&quot;true&quot;)|
+-----------------------------+-----------------------------------------------------+
|2021-01-01T00:00:01.000+08:00|                                            A,B/A+,B-|
|2021-01-01T00:00:02.000+08:00|                                            A,A+/A,B+|
|2021-01-01T00:00:03.000+08:00|                                               B+/B,B|
|2021-01-01T00:00:04.000+08:00|                                            A+,A/A+,A|
|2021-01-01T00:00:05.000+08:00|                                             A,B-/B,B|
+-----------------------------+-----------------------------------------------------+
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br></div></div></div> <div class="page-nav"><p class="inner"><span class="prev">
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