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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><meta name="viewport" content="width=device-width, initial-scale=0.8"/><title>9 Regular Expressions</title><link rel="stylesheet" type="text/css" href="../scribble.css" title="default"/><link rel="stylesheet" type="text/css" href="../racket.css" title="default"/><link rel="stylesheet" type="text/css" href="icons.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-style.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../manual-racket.css" title="default"/><link rel="stylesheet" type="text/css" href="../doc-site.css" title="default"/><script type="text/javascript" src="../scribble-common.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../manual-racket.js"></script><script type="text/javascript" src="../doc-site.js"></script><script type="text/javascript" src="../local-redirect/local-redirect.js"></script><script type="text/javascript" src="../local-redirect/local-user-redirect.js"></script><!--[if IE 6]><style type="text/css">.SIEHidden { overflow: hidden; }</style><![endif]--></head><body id="doc-racket-lang-org"><div class="tocset"><div class="tocview"><div class="tocviewlist tocviewlisttopspace"><div class="tocviewtitle"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_0");">►</a></td><td></td><td><a href="index.html" class="tocviewlink" data-pltdoc="x">The Racket Guide</a></td></tr></table></div><div class="tocviewsublisttop" style="display: none;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="intro.html" class="tocviewlink" data-pltdoc="x">Welcome to Racket</a></td></tr><tr><td align="right">2 </td><td><a href="to-scheme.html" class="tocviewlink" data-pltdoc="x">Racket Essentials</a></td></tr><tr><td align="right">3 </td><td><a href="datatypes.html" class="tocviewlink" data-pltdoc="x">Built-<wbr></wbr>In Datatypes</a></td></tr><tr><td align="right">4 </td><td><a href="scheme-forms.html" class="tocviewlink" data-pltdoc="x">Expressions and Definitions</a></td></tr><tr><td align="right">5 </td><td><a href="define-struct.html" class="tocviewlink" data-pltdoc="x">Programmer-<wbr></wbr>Defined Datatypes</a></td></tr><tr><td align="right">6 </td><td><a href="modules.html" class="tocviewlink" data-pltdoc="x">Modules</a></td></tr><tr><td align="right">7 </td><td><a href="contracts.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">8 </td><td><a href="i_o.html" class="tocviewlink" data-pltdoc="x">Input and Output</a></td></tr><tr><td align="right">9 </td><td><a href="regexp.html" class="tocviewselflink" data-pltdoc="x">Regular Expressions</a></td></tr><tr><td align="right">10 </td><td><a href="control.html" class="tocviewlink" data-pltdoc="x">Exceptions and Control</a></td></tr><tr><td align="right">11 </td><td><a href="for.html" class="tocviewlink" data-pltdoc="x">Iterations and Comprehensions</a></td></tr><tr><td align="right">12 </td><td><a href="match.html" class="tocviewlink" data-pltdoc="x">Pattern Matching</a></td></tr><tr><td align="right">13 </td><td><a href="classes.html" class="tocviewlink" data-pltdoc="x">Classes and Objects</a></td></tr><tr><td align="right">14 </td><td><a href="units.html" class="tocviewlink" data-pltdoc="x">Units</a></td></tr><tr><td align="right">15 </td><td><a href="reflection.html" class="tocviewlink" data-pltdoc="x">Reflection and Dynamic Evaluation</a></td></tr><tr><td align="right">16 </td><td><a href="macros.html" class="tocviewlink" data-pltdoc="x">Macros</a></td></tr><tr><td align="right">17 </td><td><a href="languages.html" class="tocviewlink" data-pltdoc="x">Creating Languages</a></td></tr><tr><td
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string or <a href="bytestrings.html#%28tech._byte._string%29" class="techoutside" data-pltdoc="x"><span class="techinside">byte string</span></a>. The regexp matcher tries to match this
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pattern against (a portion of) another string or byte string, which we
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will call the <a name="(tech._text._string)"></a><span style="font-style: italic">text string</span>, when you call functions like
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<span class="RktSym"><a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=reference&rel=regexp.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._regexp-match%2529%2529&version=8.6" class="RktValLink Sq" data-pltdoc="x">regexp-match</a></span>. The text string is treated as raw text, and
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not as a pattern.</p><table cellspacing="0" cellpadding="0"><tr><td><p><span class="hspace"> </span><a href="regexp-intro.html" class="toclink" data-pltdoc="x">9.1<span class="hspace"> </span>Writing Regexp Patterns</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="regexp-match.html" class="toclink" data-pltdoc="x">9.2<span class="hspace"> </span>Matching Regexp Patterns</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="regexp-assert.html" class="toclink" data-pltdoc="x">9.3<span class="hspace"> </span>Basic Assertions</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="regexp-chars.html" class="toclink" data-pltdoc="x">9.4<span class="hspace"> </span>Characters and Character Classes</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="regexp-chars.html#%28part._.Some_.Frequently_.Used_.Character_.Classes%29" class="toclink" data-pltdoc="x">9.4.1<span class="hspace"> </span>Some Frequently Used Character Classes</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="regexp-chars.html#%28part._.P.O.S.I.X_character_classes%29" class="toclink" data-pltdoc="x">9.4.2<span class="hspace"> </span>POSIX character classes</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="regexp-quant.html" class="toclink" data-pltdoc="x">9.5<span class="hspace"> </span>Quantifiers</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="regexp-clusters.html" class="toclink" data-pltdoc="x">9.6<span class="hspace"> </span>Clusters</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="regexp-clusters.html#%28part._.Backreferences%29" class="toclink" data-pltdoc="x">9.6.1<span class="hspace"> </span>Backreferences</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="regexp-clusters.html#%28part._.Non-capturing_.Clusters%29" class="toclink" data-pltdoc="x">9.6.2<span class="hspace"> </span>Non-capturing Clusters</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="regexp-clusters.html#%28part._regexp-cloister%29" class="toclink" data-pltdoc="x">9.6.3<span class="hspace"> </span>Cloisters</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="regexp-alternation.html" class="toclink" data-pltdoc="x">9.7<span class="hspace"> </span>Alternation</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Backtracking.html" class="toclink" data-pltdoc="x">9.8<span class="hspace"> </span>Backtracking</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Looking_Ahead_and_Behind.html" class="toclink" data-pltdoc="x">9.9<span class="hspace"> </span>Looking Ahead and Behind</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Looking_Ahead_and_Behind.html#%28part._.Lookahead%29" class="toclink" data-pltdoc="x">9.9.1<span class="hspace"> </span>Lookahead</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="Looking_Ahead_and_Behind.html#%28part._.Lookbehind%29" class="toclink" data-pltdoc="x">9.9.2<span class="hspace"> </span>Lookbehind</a></p></td></tr><tr><td><p><span class="hspace"> </span><a href="An_Extended_Example.html" class="toclink" data-pltdoc="x">9.10<span class="hspace"> </span>An Extended Example</a></p></td></tr></table><blockquote class="refpara"><blockquote class="refcolumn"><blockquote class="refcontent"><p><span class="imageleft"><img src="magnify.png" alt="+" width="24" height="24"/></span><a href="https://download.racket-lang.org/releases/8.6/doc/local-redirect/index.html?doc=reference&rel=regexp.html&a
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