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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-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" 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href="doc-bibliography.html" class="tocviewlink" data-pltdoc="x">Bibliography</a></td></tr><tr><td align="right"></td><td><a href="doc-index.html" class="tocviewlink" data-pltdoc="x">Index</a></td></tr></table></div></div><div class="tocviewlist"><table cellspacing="0" cellpadding="0"><tr><td style="width: 1em;"><a href="javascript:void(0);" title="Expand/Collapse" class="tocviewtoggle" onclick="TocviewToggle(this,"tocview_1");">▼</a></td><td>9 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Regular Expressions</a></td></tr></table><div class="tocviewsublistbottom" style="display: block;" id="tocview_1"><table cellspacing="0" cellpadding="0"><tr><td align="right">9.1 </td><td><a href="regexp-intro.html" class="tocviewlink" data-pltdoc="x">Writing Regexp Patterns</a></td></tr><tr><td align="right">9.2 </td><td><a href="regexp-match.html" class="tocviewlink" data-pltdoc="x">Matching Regexp Patterns</a></td></tr><tr><td align="right">9.3 </td><td><a href="regexp-assert.html" class="tocviewlink" data-pltdoc="x">Basic Assertions</a></td></tr><tr><td align="right">9.4 </td><td><a href="regexp-chars.html" class="tocviewlink" data-pltdoc="x">Characters and Character Classes</a></td></tr><tr><td align="right">9.5 </td><td><a href="regexp-quant.html" class="tocviewlink" data-pltdoc="x">Quantifiers</a></td></tr><tr><td align="right">9.6 </td><td><a href="regexp-clusters.html" class="tocviewlink" data-pltdoc="x">Clusters</a></td></tr><tr><td align="right">9.7 </td><td><a href="regexp-alternation.html" class="tocviewlink" data-pltdoc="x">Alternation</a></td></tr><tr><td align="right">9.8 </td><td><a href="Backtracking.html" class="tocviewlink" data-pltdoc="x">Backtracking</a></td></tr><tr><td align="right">9.9 </td><td><a href="Looking_Ahead_and_Behind.html" class="tocviewlink" data-pltdoc="x">Looking Ahead and Behind</a></td></tr><tr><td align="right">9.10 </td><td><a href="An_Extended_Example.html" class="tocviewlink" data-pltdoc="x">An Extended Example</a></td></tr></table></div></div></div></div><div class="maincolumn"><div class="main"><div class="navsettop"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.7", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.7");">top</a></span><span class="navright"> <a href="io-patterns.html" title="backward to "8.6 I/O Patterns"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "The Racket Guide"" data-pltdoc="x">up</a> <a href="regexp-intro.html" title="forward to "9.1 Writing Regexp Patterns"" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "scribblings/guide/guide.scrbl")" x-source-pkg="racket-doc" x-part-tag=""regexp"">9<tt> </tt><a name="(part._regexp)"></a>Regular Expressions</h3><blockquote class="refpara"><blockquote class="refcolumn"><blockquote class="refcontent"><p>This chapter is a modified version of [<a href="doc-bibliography.html#%28cite._.Sitaram05%29" data-pltdoc="x">Sitaram05</a>].</p></blockquote></blockquote></blockquote><p>A <a name="(tech._regexp)"></a><span style="font-style: italic">regexp</span> value encapsulates a pattern that is described by a
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
pattern against (a portion of) another string or byte string, which we
will call the <a name="(tech._text._string)"></a><span style="font-style: italic">text string</span>, when you call functions like
<span class="RktSym"><a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=regexp.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._regexp-match%2529%2529&version=6.7" class="RktValLink Sq" data-pltdoc="x">regexp-match</a></span>. The text string is treated as raw text, and
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/docs/6.7/html/local-redirect/index.html?doc=reference&rel=regexp.html&version=6.7" class="Sq" data-pltdoc="x">Regular Expressions</a> in <a href="https://download.racket-lang.org/docs/6.7/html/local-redirect/index.html?doc=reference&rel=index.html&version=6.7" class="Sq" data-pltdoc="x"><span style="font-weight: bold">The Racket Reference</span></a> provides more on regexps.</p></blockquote></blockquote></blockquote><div class="navsetbottom"><span class="navleft"><form class="searchform"><input class="searchbox" style="color: #888;" type="text" value="...search manuals..." title="Enter a search string to search the manuals" onkeypress="return DoSearchKey(event, this, "6.7", "../");" onfocus="this.style.color="black"; this.style.textAlign="left"; if (this.value == "...search manuals...") this.value="";" onblur="if (this.value.match(/^ *$/)) { this.style.color="#888"; this.style.textAlign="center"; this.value="...search manuals..."; }"/></form> <a href="../index.html" title="up to the documentation top" data-pltdoc="x" onclick="return GotoPLTRoot("6.7");">top</a></span><span class="navright"> <a href="io-patterns.html" title="backward to "8.6 I/O Patterns"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "The Racket Guide"" data-pltdoc="x">up</a> <a href="regexp-intro.html" title="forward to "9.1 Writing Regexp Patterns"" data-pltdoc="x">next →</a></span> </div></div></div><div id="contextindicator"> </div></body></html>
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