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<div class="section" id="tokenregexp">
<span id="token-regexp"></span><h1><span class="section-number">7.8.15. </span><code class="docutils literal notranslate"><span class="pre">TokenRegexp</span></code><a class="headerlink" href="#tokenregexp" title="Permalink to this headline">¶</a></h1>
<div class="section" id="summary">
<h2><span class="section-number">7.8.15.1. </span>Summary<a class="headerlink" href="#summary" title="Permalink to this headline">¶</a></h2>
<div class="versionadded">
<p><span class="versionmodified added">New in version 5.0.1.</span></p>
</div>
<div class="admonition caution">
<p class="admonition-title">Caution</p>
<p>This tokenizer is experimental. Specification may be changed.</p>
</div>
<div class="admonition caution">
<p class="admonition-title">Caution</p>
<p>This tokenizer can be used only with UTF-8. You can’t use this
tokenizer with EUC-JP, Shift_JIS and so on.</p>
</div>
<p><code class="docutils literal notranslate"><span class="pre">TokenRegexp</span></code> is a tokenizer for supporting regular expression
search by index.</p>
</div>
<div class="section" id="syntax">
<h2><span class="section-number">7.8.15.2. </span>Syntax<a class="headerlink" href="#syntax" title="Permalink to this headline">¶</a></h2>
<p><code class="docutils literal notranslate"><span class="pre">TokenRegexp</span></code> hasn’t parameter:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>TokenRegexp
</pre></div>
</div>
</div>
<div class="section" id="usage">
<h2><span class="section-number">7.8.15.3. </span>Usage<a class="headerlink" href="#usage" title="Permalink to this headline">¶</a></h2>
<p>In general, regular expression search is evaluated as sequential
search. But the following cases can be evaluated as index search:</p>
<blockquote>
<div><ul class="simple">
<li><p>Literal only case such as <code class="docutils literal notranslate"><span class="pre">hello</span></code></p></li>
<li><p>The beginning of text and literal case such as <code class="docutils literal notranslate"><span class="pre">\A/home/alice</span></code></p></li>
<li><p>The end of text and literal case such as <code class="docutils literal notranslate"><span class="pre">\.txt\z</span></code></p></li>
</ul>
</div></blockquote>
<p>In most cases, index search is faster than sequential search.</p>
<p><code class="docutils literal notranslate"><span class="pre">TokenRegexp</span></code> is based on bigram tokenize method. <code class="docutils literal notranslate"><span class="pre">TokenRegexp</span></code>
adds the beginning of text mark (<code class="docutils literal notranslate"><span class="pre">U+FFEF</span></code>) at the begging of text
and the end of text mark (<code class="docutils literal notranslate"><span class="pre">U+FFF0</span></code>) to the end of text when you
index text:</p>
<p>Execution example:</p>
<div class="highlight-none notranslate"><div class="highlight"><pre><span></span>tokenize TokenRegexp "/home/alice/test.txt" NormalizerAuto --mode ADD
# [
# [
# 0,
# 1337566253.89858,
# 0.000355720520019531
# ],
# [
# {
# "position": 0,
# "force_prefix": false,
# "value": ""
# },
# {
# "position": 1,
# "force_prefix": false,
# "value": "/h"
# },
# {
# "position": 2,
# "force_prefix": false,
# "value": "ho"
# },
# {
# "position": 3,
# "force_prefix": false,
# "value": "om"
# },
# {
# "position": 4,
# "force_prefix": false,
# "value": "me"
# },
# {
# "position": 5,
# "force_prefix": false,
# "value": "e/"
# },
# {
# "position": 6,
# "force_prefix": false,
# "value": "/a"
# },
# {
# "position": 7,
# "force_prefix": false,
# "value": "al"
# },
# {
# "position": 8,
# "force_prefix": false,
# "value": "li"
# },
# {
# "position": 9,
# "force_prefix": false,
# "value": "ic"
# },
# {
# "position": 10,
# "force_prefix": false,
# "value": "ce"
# },
# {
# "position": 11,
# "force_prefix": false,
# "value": "e/"
# },
# {
# "position": 12,
# "force_prefix": false,
# "value": "/t"
# },
# {
# "position": 13,
# "force_prefix": false,
# "value": "te"
# },
# {
# "position": 14,
# "force_prefix": false,
# "value": "es"
# },
# {
# "position": 15,
# "force_prefix": false,
# "value": "st"
# },
# {
# "position": 16,
# "force_prefix": false,
# "value": "t."
# },
# {
# "position": 17,
# "force_prefix": false,
# "value": ".t"
# },
# {
# "position": 18,
# "force_prefix": false,
# "value": "tx"
# },
# {
# "position": 19,
# "force_prefix": false,
# "value": "xt"
# },
# {
# "position": 20,
# "force_prefix": false,
# "value": "t"
# },
# {
# "position": 21,
# "force_prefix": false,
# "value": ""
# }
# ]
# ]
</pre></div>
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<h3><a href="../../index.html">Table of Contents</a></h3>
<ul>
<li><a class="reference internal" href="#">7.8.15. <code class="docutils literal notranslate"><span class="pre">TokenRegexp</span></code></a><ul>
<li><a class="reference internal" href="#summary">7.8.15.1. Summary</a></li>
<li><a class="reference internal" href="#syntax">7.8.15.2. Syntax</a></li>
<li><a class="reference internal" href="#usage">7.8.15.3. Usage</a></li>
</ul>
</li>
</ul>
<h4>Previous topic</h4>
<p class="topless"><a href="token_pattern.html"
title="previous chapter"><span class="section-number">7.8.14. </span><code class="docutils literal notranslate"><span class="pre">TokenPattern</span></code></a></p>
<h4>Next topic</h4>
<p class="topless"><a href="token_table.html"
title="next chapter"><span class="section-number">7.8.16. </span><code class="docutils literal notranslate"><span class="pre">TokenTable</span></code></a></p>
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