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<h2 class="title"><a id="analysis-pattern-tokenizer"></a>Pattern Tokenizer<a class="edit_me edit_me_private" rel="nofollow" title="Editing on GitHub is available to Elastic" href="https://github.com/elastic/elasticsearch/edit/2.0/docs/reference/analysis/tokenizers/pattern-tokenizer.asciidoc">edit</a></h2>
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<p>A tokenizer of type <code class="literal">pattern</code> that can flexibly separate text into terms
via a regular expression. Accepts the following settings:</p>
<div class="informaltable">
<table border="1" cellpadding="4px">
<colgroup>
<col class="col_1"/>
<col class="col_2"/>
</colgroup>
<thead>
<tr>
<th align="left" valign="top">Setting</th>
<th align="left" valign="top">Description</th>
</tr>
</thead>
<tbody>
<tr>
<td align="left" valign="top"><p><code class="literal">pattern</code></p></td>
<td align="left" valign="top"><p>The regular expression pattern, defaults to <code class="literal">\W+</code>.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p><code class="literal">flags</code></p></td>
<td align="left" valign="top"><p>The regular expression flags.</p></td>
</tr>
<tr>
<td align="left" valign="top"><p><code class="literal">group</code></p></td>
<td align="left" valign="top"><p>Which group to extract into tokens. Defaults to <code class="literal">-1</code> (split).</p></td>
</tr>
</tbody>
</table>
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<p><span class="strong strong"><strong>IMPORTANT</strong></span>: The regular expression should match the <span class="strong strong"><strong>token separators</strong></span>,
not the tokens themselves.</p>
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<p>Note that you may need to escape <code class="literal">pattern</code> string literal according to
your client language rules. For example, in many programming languages
a string literal for <code class="literal">\W+</code> pattern is written as <code class="literal">"\\W+"</code>.
There is nothing special about <code class="literal">pattern</code> (you may have to escape other
string literals as well); escaping <code class="literal">pattern</code> is common just because it
often contains characters that should be escaped.</p>
</div>
<p><code class="literal">group</code> set to <code class="literal">-1</code> (the default) is equivalent to "split". Using group
>= 0 selects the matching group as the token. For example, if you have:</p>
<pre class="screen">pattern = '([^']+)'
group = 0
input = aaa 'bbb' 'ccc'</pre>
<p>the output will be two tokens: <code class="literal">'bbb'</code> and <code class="literal">'ccc'</code> (including the <code class="literal">'</code>
marks). With the same input but using group=1, the output would be:
<code class="literal">bbb</code> and <code class="literal">ccc</code> (no <code class="literal">'</code> marks).</p>
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