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<div class="section" id="tokenpattern">
<h1><span class="section-number">7.8.14. </span><code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code><a class="headerlink" href="#tokenpattern" title="Permalink to this headline">¶</a></h1>
<div class="section" id="summary">
<h2><span class="section-number">7.8.14.1. </span>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code> is a tokenizer which is used to extract tokens by regular expression.
This tokenizer extracts only token that matches the specified regular expression.</p>
<p>You can also specify multiple patterns of regular expression.</p>
</div>
<div class="section" id="syntax">
<h2><span class="section-number">7.8.14.2. </span>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code> has optional parameter.</p>
<p>Specify one pattern:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>TokenPattern("pattern", PATTERN)
</pre></div>
</div>
<p>Specify multiple patterns:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>TokenPattern("pattern", PATTERN_1, "pattern", PATTERN_2, ... "pattern", PATTERN_N)
</pre></div>
</div>
<p><code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code> can accept multiple patterns as above.</p>
</div>
<div class="section" id="usage">
<h2><span class="section-number">7.8.14.3. </span>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>Here is an example of <code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code>. As <code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code> only extracts the token which matches the specified regular expression, it is able to filter search results which only matches the extracted token.</p>
<p>For example, let’s compare search results by specific keywords. One is listed in <code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code> pattern, and the other is not listed in <code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code> pattern.</p>
<p>There are menus which contains both of specific keywords in <code class="docutils literal notranslate"><span class="pre">Foods</span></code> table.</p>
<p>Here is the sample schema and data:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>table_create Foods TABLE_NO_KEY
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create Foods name COLUMN_SCALAR Text
# [[0, 1337566253.89858, 0.000355720520019531], true]
table_create Keywords TABLE_PAT_KEY ShortText --default_tokenizer 'TokenPattern("pattern", "Apple|Orange")'
# [[0, 1337566253.89858, 0.000355720520019531], true]
column_create Keywords index COLUMN_INDEX Foods name
# [[0, 1337566253.89858, 0.000355720520019531], true]
load --table Foods
[
{"name": "Apple Pie"},
{"name": "Orange Pie"}
{"name": "Raspberry Pie"}
]
# [[0, 1337566253.89858, 0.000355720520019531], 3]
</pre></div>
</div>
<p>Then search <code class="docutils literal notranslate"><span class="pre">Apple</span> <span class="pre">Pie</span></code> with <code class="docutils literal notranslate"><span class="pre">--query</span> <span class="pre">Apple</span></code>.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>select Foods --match_columns name --query 'Apple'
# [
# [
# 0,
# 1337566253.89858,
# 0.000355720520019531
# ],
# [
# [
# [
# 1
# ],
# [
# [
# "_id",
# "UInt32"
# ],
# [
# "name",
# "Text"
# ]
# ],
# [
# 1,
# "Apple Pie"
# ]
# ]
# ]
# ]
</pre></div>
</div>
<p>In above example, <code class="docutils literal notranslate"><span class="pre">Apple</span></code> matches pattern which is specified as <code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code> pattern, <code class="docutils literal notranslate"><span class="pre">select</span></code> matches <code class="docutils literal notranslate"><span class="pre">Apple</span> <span class="pre">Pie</span></code>.</p>
<p>Then search <code class="docutils literal notranslate"><span class="pre">Raspberry</span> <span class="pre">Pie</span></code> with <code class="docutils literal notranslate"><span class="pre">--query</span> <span class="pre">Raspberry</span></code>.</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>select Foods --match_columns name --query 'Raspberry'
# [
# [
# 0,
# 1337566253.89858,
# 0.000355720520019531
# ],
# [
# [
# [
# 0
# ],
# [
# [
# "_id",
# "UInt32"
# ],
# [
# "name",
# "Text"
# ]
# ]
# ]
# ]
# ]
</pre></div>
</div>
<p>In above example, even though <code class="docutils literal notranslate"><span class="pre">Foods</span></code> table contains <code class="docutils literal notranslate"><span class="pre">Raspberry</span> <span class="pre">Pie</span></code> record, <code class="docutils literal notranslate"><span class="pre">select</span></code> doesn’t match it because <code class="docutils literal notranslate"><span class="pre">Raspberry</span></code> doesn’t match to <code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code> pattern..</p>
</div>
<div class="section" id="see-also">
<h2><span class="section-number">7.8.14.4. </span>See also<a class="headerlink" href="#see-also" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li><p><a class="reference internal" href="../commands/tokenize.html"><span class="doc">tokenize</span></a></p></li>
</ul>
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<h3><a href="../../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">7.8.14. <code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code></a><ul>
<li><a class="reference internal" href="#summary">7.8.14.1. Summary</a></li>
<li><a class="reference internal" href="#syntax">7.8.14.2. Syntax</a></li>
<li><a class="reference internal" href="#usage">7.8.14.3. Usage</a></li>
<li><a class="reference internal" href="#see-also">7.8.14.4. See also</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
<p class="topless"><a href="token_ngram.html"
title="previous chapter"><span class="section-number">7.8.13. </span><code class="docutils literal notranslate"><span class="pre">TokenNgram</span></code></a></p>
<h4>Next topic</h4>
<p class="topless"><a href="token_regexp.html"
title="next chapter"><span class="section-number">7.8.15. </span><code class="docutils literal notranslate"><span class="pre">TokenRegexp</span></code></a></p>
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