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<section id="regular-expression-function-properties">
<h1 id="admin-properties-regexp-function--page-root">Regular expression function properties<a class="headerlink" href="#admin-properties-regexp-function--page-root" title="Permalink to this heading">#</a></h1>
<p>These properties allow tuning the <a class="reference internal" href="../functions/regexp.html"><span class="doc">Regular expression functions</span></a>.</p>
<section id="regex-library">
<h2 id="regex-library"><code class="docutils literal notranslate"><span class="pre">regex-library</span></code><a class="headerlink" href="#regex-library" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p><strong>Type:</strong> <a class="reference internal" href="properties.html#prop-type-string"><span class="std std-ref">string</span></a></p></li>
<li><p><strong>Allowed values:</strong> <code class="docutils literal notranslate"><span class="pre">JONI</span></code>, <code class="docutils literal notranslate"><span class="pre">RE2J</span></code></p></li>
<li><p><strong>Default value:</strong> <code class="docutils literal notranslate"><span class="pre">JONI</span></code></p></li>
</ul>
<p>Which library to use for regular expression functions.
<code class="docutils literal notranslate"><span class="pre">JONI</span></code> is generally faster for common usage, but can require exponential
time for certain expression patterns. <code class="docutils literal notranslate"><span class="pre">RE2J</span></code> uses a different algorithm,
which guarantees linear time, but is often slower.</p>
</section>
<section id="re2j-dfa-states-limit">
<h2 id="re2j-dfa-states-limit"><code class="docutils literal notranslate"><span class="pre">re2j.dfa-states-limit</span></code><a class="headerlink" href="#re2j-dfa-states-limit" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p><strong>Type:</strong> <a class="reference internal" href="properties.html#prop-type-integer"><span class="std std-ref">integer</span></a></p></li>
<li><p><strong>Minimum value:</strong> <code class="docutils literal notranslate"><span class="pre">2</span></code></p></li>
<li><p><strong>Default value:</strong> <code class="docutils literal notranslate"><span class="pre">2147483647</span></code></p></li>
</ul>
<p>The maximum number of states to use when RE2J builds the fast,
but potentially memory intensive, deterministic finite automaton (DFA)
for regular expression matching. If the limit is reached, RE2J falls
back to the algorithm that uses the slower, but less memory intensive
non-deterministic finite automaton (NFA). Decreasing this value decreases the
maximum memory footprint of a regular expression search at the cost of speed.</p>
</section>
<section id="re2j-dfa-retries">
<h2 id="re2j-dfa-retries"><code class="docutils literal notranslate"><span class="pre">re2j.dfa-retries</span></code><a class="headerlink" href="#re2j-dfa-retries" title="Permalink to this heading">#</a></h2>
<ul class="simple">
<li><p><strong>Type:</strong> <a class="reference internal" href="properties.html#prop-type-integer"><span class="std std-ref">integer</span></a></p></li>
<li><p><strong>Minimum value:</strong> <code class="docutils literal notranslate"><span class="pre">0</span></code></p></li>
<li><p><strong>Default value:</strong> <code class="docutils literal notranslate"><span class="pre">5</span></code></p></li>
</ul>
<p>The number of times that RE2J retries the DFA algorithm, when
it reaches a states limit before using the slower, but less memory
intensive NFA algorithm, for all future inputs for that search. If hitting the
limit for a given input row is likely to be an outlier, you want to be able
to process subsequent rows using the faster DFA algorithm. If you are likely
to hit the limit on matches for subsequent rows as well, you want to use the
correct algorithm from the beginning so as not to waste time and resources.
The more rows you are processing, the larger this value should be.</p>
</section>
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