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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>26 Strings</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="../manual-style.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="../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">Unstable:<span class="mywbr"> </span> May Change Without Warning</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right">1 </td><td><a href="guidelines.html" class="tocviewlink" data-pltdoc="x">Guidelines for Developing <span class="RktSym">unstable</span> Libraries</a></td></tr><tr><td align="right">2 </td><td><a href="Automata__Compiling_State_Machines.html" class="tocviewlink" data-pltdoc="x">Automata:<span class="mywbr"> </span> Compiling State Machines</a></td></tr><tr><td align="right">3 </td><td><a href="bytes.html" class="tocviewlink" data-pltdoc="x">Bytes</a></td></tr><tr><td align="right">4 </td><td><a href="contract.html" class="tocviewlink" data-pltdoc="x">Contracts</a></td></tr><tr><td align="right">5 </td><td><a href="wrapc.html" class="tocviewlink" data-pltdoc="x">Contracts for Macro Subexpressions</a></td></tr><tr><td align="right">6 </td><td><a href="Debugging.html" class="tocviewlink" data-pltdoc="x">Debugging</a></td></tr><tr><td align="right">7 </td><td><a href="Definitions.html" class="tocviewlink" data-pltdoc="x">Definitions</a></td></tr><tr><td align="right">8 </td><td><a href="error.html" class="tocviewlink" data-pltdoc="x">Errors</a></td></tr><tr><td align="right">9 </td><td><a href="future.html" class="tocviewlink" data-pltdoc="x">Futures</a></td></tr><tr><td align="right">10 </td><td><a href="Functions.html" class="tocviewlink" data-pltdoc="x">Functions</a></td></tr><tr><td align="right">11 </td><td><a href="Hash_Tables.html" class="tocviewlink" data-pltdoc="x">Hash Tables</a></td></tr><tr><td align="right">12 </td><td><a href="class-iop.html" class="tocviewlink" data-pltdoc="x">Interface-<wbr></wbr>Oriented Programming for Classes</a></td></tr><tr><td align="right">13 </td><td><a href="lazy-require.html" class="tocviewlink" data-pltdoc="x">Lazy Require</a></td></tr><tr><td align="right">14 </td><td><a href="list.html" class="tocviewlink" data-pltdoc="x">Lists</a></td></tr><tr><td align="right">15 </td><td><a href="Logging.html" class="tocviewlink" data-pltdoc="x">Logging</a></td></tr><tr><td align="right">16 </td><td><a href="macro-testing.html" class="tocviewlink" data-pltdoc="x">Macro Testing</a></td></tr><tr><td align="right">17 </td><td><a href="Mark_Parameters.html" class="tocviewlink" data-pltdoc="x">Mark Parameters</a></td></tr><tr><td align="right">18 </td><td><a href="match.html" class="tocviewlink" data-pltdoc="x">Match</a></td></tr><tr><td align="right">19 </td><td><a href="open-place.html" class="tocviewlink" data-pltdoc="x">Open <span class="RktSym"><span class="RktStxLink">place</span></span> expressions</a></td></tr><tr><td align="right">20 </td><td><a href="options.html" class="tocviewlink" data-pltdoc="x">Option Contracts</a></td></tr><tr><td align="right">21 </td><td><a href="Parameter_Groups.html" class="tocviewlink" data-pltdoc="x">Parameter Groups</a></td></tr><tr><td align="right">22 </td><td><a href="Pretty-Printing.html" class="tocviewlink" data-pltdoc="x">Pretty-<wbr></wbr>Printing</a></td></tr><tr><td align="right">23 </td><td><a href="recontract.html" class="tocviewlink" data-pltdoc="x">Re-<wbr></wbr>Contracting Identifiers</a></td></tr><tr><td align="right">24 </td><td><a href="sandbox.html" class="tocviewlink" data-pltdoc="x">Sandbox</a></td></tr><tr><td align="right">25 </td><td><a href="sequence.html" class="tocviewlink" data-pltdoc="x">Sequences</a></td></tr><tr><td align="right">26 </td><td><a href="" class="tocviewselflink" data-pltdoc="x">Strings</a></td></tr><tr><td align="right">27 </td><td><a href="struct.html" class="tocviewlink" data-pltdoc="x">Structs</a></td></tr><tr><td align="right">28 </td><td><a href="custom-write.html" class="tocviewlink" data-pltdoc="x">Struct Printing</a></td></tr><tr><td align="right">29 </td><td><a href="syntax.html" class="tocviewlink" data-pltdoc="x">Syntax</a></td></tr><tr><td align="right">30 </td><td><a href="temp-c.html" class="tocviewlink" data-pltdoc="x">Temporal Contracts:<span class="mywbr"> </span> Explicit Contract Monitors</a></td></tr><tr><td align="right">31 </td><td><a href="unix-socket.html" class="tocviewlink" data-pltdoc="x">Unix Domain Sockets</a></td></tr><tr><td align="right">32 </td><td><a href="2d.html" class="tocviewlink" data-pltdoc="x">2D Syntax</a></td></tr></table></div></div></div><div class="tocsub"><div class="tocsubtitle">On this page:</div><table class="tocsublist" cellspacing="0"><tr><td><a href="#%28def._%28%28lib._unstable%2Fstring..rkt%29._regexp-filter%29%29" class="tocsublink" data-pltdoc="x"><span class="RktSym"><span class="RktValLink">regexp-<wbr></wbr>filter</span></span></a></td></tr></table></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, "6.1", "../");" 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("6.1");">top</a></span><span class="navright"> <a href="sequence.html" title="backward to "25 Sequences"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Unstable: May Change Without Warning"" data-pltdoc="x">up</a> <a href="struct.html" title="forward to "27 Structs"" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "unstable/scribblings/unstable.scrbl")" x-part-tag=""string"">26<tt> </tt><a name="(part._string)"></a><a name="(mod-path._unstable/string)"></a>Strings</h3><p>This library is <span style="font-style: italic">unstable</span>;
compatibility will not be maintained.
See <a href="index.html" data-pltdoc="x">Unstable: May Change Without Warning</a>
for more information.</p><p><table cellspacing="0" cellpadding="0" class="defmodule"><tr><td align="left"><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=require.html%23%2528form._%2528%2528lib._racket%252Fprivate%252Fbase..rkt%2529._require%2529%2529&version=6.1" class="RktStxLink Sq" data-pltdoc="x">require</a></span><span class="stt"> </span><a href="" class="RktModLink" data-pltdoc="x"><span class="RktSym">unstable/string</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">unstable-lib</span></span></td></tr></table></p><blockquote class="refpara"><blockquote class="refcolumn"><blockquote class="refcontent"><p>The subsequent bindings were added by Vincent St-Amour.</p></blockquote></blockquote></blockquote><p><div class="SIntrapara"><blockquote class="SVInsetFlow"><table cellspacing="0" cellpadding="0" class="boxed RBoxed"><tr><td><blockquote class="SubFlow"><div class="RBackgroundLabel SIEHidden"><div class="RBackgroundLabelInner"><p>procedure</p></div></div><p class="RForeground"><span class="RktPn">(</span><a name="(def._((lib._unstable/string..rkt)._regexp-filter))"></a><span title="Provided from: unstable/string | Package: unstable-lib"><span class="RktSym"><a href="#%28def._%28%28lib._unstable%2Fstring..rkt%29._regexp-filter%29%29" class="RktValDef RktValLink" data-pltdoc="x">regexp-filter</a></span></span><span class="hspace"> </span><span class="RktVar">pattern</span><span class="hspace"> </span><span class="RktVar">lst</span><span class="RktPn">)</span></p></blockquote></td></tr><tr><td><span class="hspace"> </span>→<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._listof%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">listof</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=bytestrings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._bytes%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">bytes?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=Manipulating_Paths.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._path%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">path?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._input-port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">input-port?</a></span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">pattern</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=bytestrings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._bytes%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">bytes?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=regexp.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._regexp%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">regexp?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=regexp.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._byte-regexp%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">byte-regexp?</a></span><span class="RktPn">)</span></td></tr><tr><td><span class="hspace"> </span><span class="RktVar">lst</span><span class="hspace"> </span>:<span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fprivate%252Fmisc..rkt%2529._listof%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">listof</a></span><span class="hspace"> </span><span class="RktPn">(</span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=data-structure-contracts.html%23%2528def._%2528%2528lib._racket%252Fcontract%252Fbase..rkt%2529._or%252Fc%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">or/c</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=strings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._string%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">string?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=bytestrings.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._bytes%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">bytes?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=Manipulating_Paths.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._path%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">path?</a></span><span class="hspace"> </span><span class="RktSym"><a href="http://download.racket-lang.org/docs/6.1/html/local-redirect/index.html?doc=reference&rel=port-ops.html%23%2528def._%2528%2528quote._%7E23%7E25kernel%2529._input-port%7E3f%2529%2529&version=6.1" class="RktValLink Sq" data-pltdoc="x">input-port?</a></span><span class="RktPn">)</span><span class="RktPn">)</span></td></tr></table></blockquote></div><div class="SIntrapara">Keeps only the elements of <span class="RktVar">lst</span> that match <span class="RktVar">pattern</span>.</div></p><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, "6.1", "../");" 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("6.1");">top</a></span><span class="navright"> <a href="sequence.html" title="backward to "25 Sequences"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "Unstable: May Change Without Warning"" 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