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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"/><title>SRFI 13: String Libraries</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">SRFIs:<span class="mywbr"> </span> Libraries</a></td></tr></table></div><div class="tocviewsublistonly" style="display: block;" id="tocview_0"><table cellspacing="0" cellpadding="0"><tr><td align="right"></td><td><a href="srfi-1.html" class="tocviewlink" data-pltdoc="x">SRFI 1:<span class="mywbr"> </span> List Library</a></td></tr><tr><td align="right"></td><td><a href="srfi-2.html" class="tocviewlink" data-pltdoc="x">SRFI 2:<span class="mywbr"> </span> AND-<wbr></wbr>LET*:<span class="mywbr"> </span> an AND with local bindings...</a></td></tr><tr><td align="right"></td><td><a href="srfi-4.html" class="tocviewlink" data-pltdoc="x">SRFI 4:<span class="mywbr"> </span> Homogeneous numeric vector datatypes</a></td></tr><tr><td align="right"></td><td><a href="srfi-5.html" class="tocviewlink" data-pltdoc="x">SRFI 5:<span class="mywbr"> </span> A compatible let form with signatures and rest arguments</a></td></tr><tr><td align="right"></td><td><a href="srfi-6.html" class="tocviewlink" data-pltdoc="x">SRFI 6:<span class="mywbr"> </span> Basic String Ports</a></td></tr><tr><td align="right"></td><td><a href="srfi-7.html" class="tocviewlink" data-pltdoc="x">SRFI 7:<span class="mywbr"> </span> Feature-<wbr></wbr>based program configuration language</a></td></tr><tr><td align="right"></td><td><a href="srfi-8.html" class="tocviewlink" data-pltdoc="x">SRFI 8:<span class="mywbr"> </span> RECEIVE:<span class="mywbr"> </span> Binding to multiple values</a></td></tr><tr><td align="right"></td><td><a href="srfi-9.html" class="tocviewlink" data-pltdoc="x">SRFI 9:<span class="mywbr"> </span> Defining Record Types</a></td></tr><tr><td align="right"></td><td><a href="srfi-11.html" class="tocviewlink" data-pltdoc="x">SRFI 11:<span class="mywbr"> </span> Syntax for receiving multiple values</a></td></tr><tr><td align="right"></td><td><a href="" class="tocviewselflink" data-pltdoc="x">SRFI 13:<span class="mywbr"> </span> String Libraries</a></td></tr><tr><td align="right"></td><td><a href="srfi-14.html" class="tocviewlink" data-pltdoc="x">SRFI 14:<span class="mywbr"> </span> Character-<wbr></wbr>set Library</a></td></tr><tr><td align="right"></td><td><a href="srfi-16.html" class="tocviewlink" data-pltdoc="x">SRFI 16:<span class="mywbr"> </span> Syntax for procedures of variable arity</a></td></tr><tr><td align="right"></td><td><a href="srfi-17.html" class="tocviewlink" data-pltdoc="x">SRFI 17:<span class="mywbr"> </span> Generalized set!</a></td></tr><tr><td align="right"></td><td><a href="srfi-19.html" class="tocviewlink" data-pltdoc="x">SRFI 19:<span class="mywbr"> </span> Time Data Types and Procedures</a></td></tr><tr><td align="right"></td><td><a href="srfi-23.html" class="tocviewlink" data-pltdoc="x">SRFI 23:<span class="mywbr"> </span> Error reporting mechanism</a></td></tr><tr><td align="right"></td><td><a href="srfi-25.html" class="tocviewlink" data-pltdoc="x">SRFI 25:<span class="mywbr"> </span> Multi-<wbr></wbr>dimensional Array Primitives</a></td></tr><tr><td align="right"></td><td><a href="srfi-26.html" class="tocviewlink" data-pltdoc="x">SRFI 26:<span class="mywbr"> </span> Notation for Specializing Parameters without Currying</a></td></tr><tr><td align="right"></td><td><a href="srfi-27.html" class="tocviewlink" data-pltdoc="x">SRFI 27:<span class="mywbr"> </span> Sources of Random Bits</a></td></tr><tr><td align="right"></td><td><a href="srfi-28.html" class="tocviewlink" data-pltdoc="x">SRFI 28:<span class="mywbr"> </span> Basic Format Strings</a></td></tr><tr><td align="right"></td><td><a href="srfi-29.html" class="tocviewlink" data-pltdoc="x">SRFI 29:<span class="mywbr"> </span> Localization</a></td></tr><tr><td align="right"></td><td><a href="srfi-30.html" class="tocviewlink" data-pltdoc="x">SRFI 30:<span class="mywbr"> </span> Nested Multi-<wbr></wbr>line Comments</a></td></tr><tr><td align="right"></td><td><a href="srfi-31.html" class="tocviewlink" data-pltdoc="x">SRFI 31:<span class="mywbr"> </span> A special form rec for recursive evaluation</a></td></tr><tr><td align="right"></td><td><a href="srfi-34.html" class="tocviewlink" data-pltdoc="x">SRFI 34:<span class="mywbr"> </span> Exception Handling for Programs</a></td></tr><tr><td align="right"></td><td><a href="srfi-35.html" class="tocviewlink" data-pltdoc="x">SRFI 35:<span class="mywbr"> </span> Conditions</a></td></tr><tr><td align="right"></td><td><a href="srfi-38.html" class="tocviewlink" data-pltdoc="x">SRFI 38:<span class="mywbr"> </span> External Representation for Data With Shared Structure</a></td></tr><tr><td align="right"></td><td><a href="srfi-39.html" class="tocviewlink" data-pltdoc="x">SRFI 39:<span class="mywbr"> </span> Parameter objects</a></td></tr><tr><td align="right"></td><td><a href="srfi-40.html" class="tocviewlink" data-pltdoc="x">SRFI 40:<span class="mywbr"> </span> A Library of Streams</a></td></tr><tr><td align="right"></td><td><a href="srfi-41.html" class="tocviewlink" data-pltdoc="x">SRFI 41:<span class="mywbr"> </span> Streams</a></td></tr><tr><td align="right"></td><td><a href="srfi-42.html" class="tocviewlink" data-pltdoc="x">SRFI 42:<span class="mywbr"> </span> Eager Comprehensions</a></td></tr><tr><td align="right"></td><td><a href="srfi-43.html" class="tocviewlink" data-pltdoc="x">SRFI 43:<span class="mywbr"> </span> Vector Library</a></td></tr><tr><td align="right"></td><td><a href="srfi-45.html" class="tocviewlink" data-pltdoc="x">SRFI 45:<span class="mywbr"> </span> Primitives for Expressing Iterative Lazy Algorithms</a></td></tr><tr><td align="right"></td><td><a href="srfi-48.html" class="tocviewlink" data-pltdoc="x">SRFI 48:<span class="mywbr"> </span> Intermediate Format Strings</a></td></tr><tr><td align="right"></td><td><a href="srfi-54.html" class="tocviewlink" data-pltdoc="x">SRFI 54:<span class="mywbr"> </span> Formatting</a></td></tr><tr><td align="right"></td><td><a href="srfi-57.html" class="tocviewlink" data-pltdoc="x">SRFI 57:<span class="mywbr"> </span> Records</a></td></tr><tr><td align="right"></td><td><a href="srfi-59.html" class="tocviewlink" data-pltdoc="x">SRFI 59:<span class="mywbr"> </span> Vicinity</a></td></tr><tr><td align="right"></td><td><a href="srfi-60.html" class="tocviewlink" data-pltdoc="x">SRFI 60:<span class="mywbr"> </span> Integers as Bits</a></td></tr><tr><td align="right"></td><td><a href="srfi-61.html" class="tocviewlink" data-pltdoc="x">SRFI 61:<span class="mywbr"> </span> A more general cond clause</a></td></tr><tr><td align="right"></td><td><a href="srfi-62.html" class="tocviewlink" data-pltdoc="x">SRFI 62:<span class="mywbr"> </span> S-<wbr></wbr>expression comments</a></td></tr><tr><td align="right"></td><td><a href="srfi-63.html" class="tocviewlink" data-pltdoc="x">SRFI 63:<span class="mywbr"> </span> Homogeneous and Heterogeneous Arrays</a></td></tr><tr><td align="right"></td><td><a href="srfi-64.html" class="tocviewlink" data-pltdoc="x">SRFI 64:<span class="mywbr"> </span> A Scheme API for test suites</a></td></tr><tr><td align="right"></td><td><a href="srfi-66.html" class="tocviewlink" data-pltdoc="x">SRFI 66:<span class="mywbr"> </span> Octet Vectors</a></td></tr><tr><td align="right"></td><td><a href="srfi-67.html" class="tocviewlink" data-pltdoc="x">SRFI 67:<span class="mywbr"> </span> Compare Procedures</a></td></tr><tr><td align="right"></td><td><a href="srfi-69.html" class="tocviewlink" data-pltdoc="x">SRFI 69:<span class="mywbr"> </span> Basic hash tables</a></td></tr><tr><td align="right"></td><td><a href="srfi-71.html" class="tocviewlink" data-pltdoc="x">SRFI 71:<span class="mywbr"> </span> Extended LET-<wbr></wbr>syntax for multiple values</a></td></tr><tr><td align="right"></td><td><a href="srfi-74.html" class="tocviewlink" data-pltdoc="x">SRFI 74:<span class="mywbr"> </span> Octet-<wbr></wbr>Addressed Binary Blocks</a></td></tr><tr><td align="right"></td><td><a href="srfi-78.html" class="tocviewlink" data-pltdoc="x">SRFI 78:<span class="mywbr"> </span> Lightweight testing</a></td></tr><tr><td align="right"></td><td><a href="srfi-86.html" class="tocviewlink" data-pltdoc="x">SRFI 86:<span class="mywbr"> </span> MU & NU simulating VALUES & CALL-<wbr></wbr>WITH-<wbr></wbr>VALUES...</a></td></tr><tr><td align="right"></td><td><a href="srfi-87.html" class="tocviewlink" data-pltdoc="x">SRFI 87:<span class="mywbr"> </span> => in case clauses</a></td></tr><tr><td align="right"></td><td><a href="srfi-98.html" class="tocviewlink" data-pltdoc="x">SRFI 98:<span class="mywbr"> </span> An interface to access environment variables</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></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="srfi-11.html" title="backward to "SRFI 11: Syntax for receiving multiple values"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "SRFIs: Libraries"" data-pltdoc="x">up</a> <a href="srfi-14.html" title="forward to "SRFI 14: Character-set Library"" data-pltdoc="x">next →</a></span> </div><h3 x-source-module="(lib "srfi/scribblings/srfi.scrbl")" x-part-tag=""srfi-13""><a name="(part._srfi-13)"></a><a name="(mod-path._srfi/13)"></a>SRFI 13: String Libraries</h3><p><div class="SIntrapara"><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">srfi/13</span></a><span class="RktPn">)</span></td><td align="right"><span class="RpackageSpec"><span class="Smaller"> package:</span> <span class="stt">srfi-lite-lib</span></span></td></tr></table></div><div class="SIntrapara">Original specification: <a href="./srfi-std/srfi-13.html">SRFI 13</a></div></p><p><a name="(def._((lib._srfi/13..rkt)._string~3f))"></a><a name="(def._((lib._srfi/13..rkt)._string-null~3f))"></a><a name="(def._((lib._srfi/13..rkt)._string-every))"></a><a name="(def._((lib._srfi/13..rkt)._string-any))"></a><a name="(def._((lib._srfi/13..rkt)._make-string))"></a><a name="(def._((lib._srfi/13..rkt)._string))"></a><a name="(def._((lib._srfi/13..rkt)._string-tabulate))"></a><a name="(def._((lib._srfi/13..rkt)._string-~3elist))"></a><a name="(def._((lib._srfi/13..rkt)._list-~3estring))"></a><a name="(def._((lib._srfi/13..rkt)._reverse-list-~3estring))"></a><a name="(def._((lib._srfi/13..rkt)._string-join))"></a><a name="(def._((lib._srfi/13..rkt)._string-length))"></a><a name="(def._((lib._srfi/13..rkt)._string-ref))"></a><a name="(def._((lib._srfi/13..rkt)._string-copy))"></a><a name="(def._((lib._srfi/13..rkt)._substring/shared))"></a><a name="(def._((lib._srfi/13..rkt)._string-copy!))"></a><a name="(def._((lib._srfi/13..rkt)._string-take))"></a><a name="(def._((lib._srfi/13..rkt)._string-drop))"></a><a name="(def._((lib._srfi/13..rkt)._string-take-right))"></a><a name="(def._((lib._srfi/13..rkt)._string-drop-right))"></a><a name="(def._((lib._srfi/13..rkt)._string-pad))"></a><a name="(def._((lib._srfi/13..rkt)._string-pad-right))"></a><a name="(def._((lib._srfi/13..rkt)._string-trim))"></a><a name="(def._((lib._srfi/13..rkt)._string-trim-right))"></a><a name="(def._((lib._srfi/13..rkt)._string-trim-both))"></a><a name="(def._((lib._srfi/13..rkt)._string-set!))"></a><a name="(def._((lib._srfi/13..rkt)._string-fill!))"></a><a name="(def._((lib._srfi/13..rkt)._string-compare))"></a><a name="(def._((lib._srfi/13..rkt)._string-compare-ci))"></a><a name="(def._((lib._srfi/13..rkt)._string~3d))"></a><a name="(def._((lib._srfi/13..rkt)._string~3c~3e))"></a><a name="(def._((lib._srfi/13..rkt)._string~3c))"></a><a name="(def._((lib._srfi/13..rkt)._string~3e))"></a><a name="(def._((lib._srfi/13..rkt)._string~3c~3d))"></a><a name="(def._((lib._srfi/13..rkt)._string~3e~3d))"></a><a name="(def._((lib._srfi/13..rkt)._string-ci~3d))"></a><a name="(def._((lib._srfi/13..rkt)._string-ci~3c~3e))"></a><a name="(def._((lib._srfi/13..rkt)._string-ci~3c))"></a><a name="(def._((lib._srfi/13..rkt)._string-ci~3e))"></a><a name="(def._((lib._srfi/13..rkt)._string-ci~3c~3d))"></a><a name="(def._((lib._srfi/13..rkt)._string-ci~3e~3d))"></a><a name="(def._((lib._srfi/13..rkt)._string-hash))"></a><a name="(def._((lib._srfi/13..rkt)._string-hash-ci))"></a><a name="(def._((lib._srfi/13..rkt)._string-prefix-length))"></a><a name="(def._((lib._srfi/13..rkt)._string-suffix-length))"></a><a name="(def._((lib._srfi/13..rkt)._string-prefix-length-ci))"></a><a name="(def._((lib._srfi/13..rkt)._string-suffix-length-ci))"></a><a name="(def._((lib._srfi/13..rkt)._string-prefix~3f))"></a><a name="(def._((lib._srfi/13..rkt)._string-suffix~3f))"></a><a name="(def._((lib._srfi/13..rkt)._string-prefix-ci~3f))"></a><a name="(def._((lib._srfi/13..rkt)._string-suffix-ci~3f))"></a><a name="(def._((lib._srfi/13..rkt)._string-index))"></a><a name="(def._((lib._srfi/13..rkt)._string-index-right))"></a><a name="(def._((lib._srfi/13..rkt)._string-skip))"></a><a name="(def._((lib._srfi/13..rkt)._string-skip-right))"></a><a name="(def._((lib._srfi/13..rkt)._string-count))"></a><a name="(def._((lib._srfi/13..rkt)._string-contains))"></a><a name="(def._((lib._srfi/13..rkt)._string-contains-ci))"></a><a name="(def._((lib._srfi/13..rkt)._string-titlecase))"></a><a name="(def._((lib._srfi/13..rkt)._string-titlecase!))"></a><a name="(def._((lib._srfi/13..rkt)._string-upcase))"></a><a name="(def._((lib._srfi/13..rkt)._string-upcase!))"></a><a name="(def._((lib._srfi/13..rkt)._string-downcase))"></a><a name="(def._((lib._srfi/13..rkt)._string-downcase!))"></a><a name="(def._((lib._srfi/13..rkt)._string-reverse))"></a><a name="(def._((lib._srfi/13..rkt)._string-reverse!))"></a><a name="(def._((lib._srfi/13..rkt)._string-append))"></a><a name="(def._((lib._srfi/13..rkt)._string-concatenate))"></a><a name="(def._((lib._srfi/13..rkt)._string-concatenate/shared))"></a><a name="(def._((lib._srfi/13..rkt)._string-append/shared))"></a><a name="(def._((lib._srfi/13..rkt)._string-concatenate-reverse))"></a><a name="(def._((lib._srfi/13..rkt)._string-concatenate-reverse/shared))"></a><a name="(def._((lib._srfi/13..rkt)._string-map))"></a><a name="(def._((lib._srfi/13..rkt)._string-map!))"></a><a name="(def._((lib._srfi/13..rkt)._string-fold))"></a><a name="(def._((lib._srfi/13..rkt)._string-fold-right))"></a><a name="(def._((lib._srfi/13..rkt)._string-unfold))"></a><a name="(def._((lib._srfi/13..rkt)._string-unfold-right))"></a><a name="(def._((lib._srfi/13..rkt)._string-for-each))"></a><a name="(def._((lib._srfi/13..rkt)._string-for-each-index))"></a><a name="(def._((lib._srfi/13..rkt)._xsubstring))"></a><a name="(def._((lib._srfi/13..rkt)._string-xcopy!))"></a><a name="(def._((lib._srfi/13..rkt)._string-replace))"></a><a name="(def._((lib._srfi/13..rkt)._string-tokenize))"></a><a name="(def._((lib._srfi/13..rkt)._string-filter))"></a><a name="(def._((lib._srfi/13..rkt)._string-delete))"></a><a name="(def._((lib._srfi/13..rkt)._string-parse-start+end))"></a><a name="(def._((lib._srfi/13..rkt)._string-parse-final-start+end))"></a><a name="(def._((lib._srfi/13..rkt)._let-string-start+end))"></a><a name="(def._((lib._srfi/13..rkt)._check-substring-spec))"></a><a name="(def._((lib._srfi/13..rkt)._substring-spec-ok~3f))"></a><a name="(def._((lib._srfi/13..rkt)._make-kmp-restart-vector))"></a><a name="(def._((lib._srfi/13..rkt)._kmp-step))"></a><a name="(def._((lib._srfi/13..rkt)._string-kmp-partial-search))"></a></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="srfi-11.html" title="backward to "SRFI 11: Syntax for receiving multiple values"" data-pltdoc="x">← prev</a> <a href="index.html" title="up to "SRFIs: Libraries"" data-pltdoc="x">up</a> <a href="srfi-14.html" title="forward to "SRFI 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