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<h1>Parle pattern matching</h1>
<h2>Table of Contents</h2><ul class="chunklist chunklist_chapter"><li><a href="parle.regex.chars.html">Character representations</a></li><li><a href="parle.regex.charclass.html">Character classes</a></li><li><a href="parle.regex.unicodecharclass.html">Unicode character classes</a></li><li><a href="parle.regex.alternation.html">Alternation and repetition</a></li><li><a href="parle.regex.anchors.html">Anchors</a></li><li><a href="parle.regex.grouping.html">Grouping</a></li></ul>
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Parle supports regex matching similar to flex. Also supported are the following POSIX character sets: <em>[:alnum:]</em>, <em>[:alpha:]</em>, <em>[:blank:]</em>, <em>[:cntrl:]</em>, <em>[:digit:]</em>, <em>[:graph:]</em>, <em>[:lower:]</em>, <em>[:print:]</em>, <em>[:punct:]</em>, <em>[:space:]</em>, <em>[:upper:]</em> and <em>[:xdigit:]</em>.
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The Unicode character classes are currently not enabled by default, pass --enable-parle-utf32 to make them available. A particular encoding can be mapped with a correctly constructed regex. For example, to match the EURO symbol encoded in UTF-8, the regular expression <em>[\xe2][\x82][\xac]</em> can be used. The pattern for an UTF-8 encoded string could be <em>[ -\x7f]{+}[\x80-\xbf]{+}[\xc2-\xdf]{+}[\xe0-\xef]{+}[\xf0-\xff]+</em>.
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