📄 regex.h.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN"><html><head><!-- Copyright 1997 The Open Group, All Rights Reserved --><title>&lt;regex.h&gt;</title></head><body bgcolor=white><center><font size=2>The Single UNIX &reg; Specification, Version 2<br>Copyright &copy; 1997 The Open Group</font></center><hr size=2 noshade><h4><a name = "tag_000_008_033">&nbsp;</a>NAME</h4><blockquote>regex.h - regular-expression-matching types</blockquote><h4><a name = "tag_000_008_034">&nbsp;</a>SYNOPSIS</h4><blockquote><pre><code>#include &lt;regex.h&gt;</code></pre></blockquote><h4><a name = "tag_000_008_035">&nbsp;</a>DESCRIPTION</h4><blockquote>The<i>&lt;regex.h&gt;</i>header defines the structures and symbolic constants used by the<i><a href="regcomp.html">regcomp()</a></i>,<i><a href="regexec.html">regexec()</a></i>,<i><a href="regerror.html">regerror()</a></i>and<i><a href="regfree.html">regfree()</a></i>functions.<p>The structure type<b>regex_t</b>contains at least the following member:<pre><code>size_t    re_nsub    number of parenthesised subexpressions</code></pre><p>The type <b>regoff_t</b> is defined as a signed arithmetic type that can holdthe largest value that can be stored in either a type <b>off_t</b> or type<b>ssize_t</b>.The structure type<b>regmatch_t</b>contains at least the following members:<pre><code>regoff_t    rm_so    byte offset from start of <i>string</i>                     to start of substringregoff_t    rm_eo    byte offset from start of <i>string</i>                     of the first character after the end of substring</code></pre><p>Values for the<i>cflags</i>parameter to the<i><a href="regcomp.html">regcomp()</a></i>function:<dl compact><dt>REG_EXTENDED<dd>Use Extended Regular Expressions.<dt>REG_ICASE<dd>Ignore case in match.<dt>REG_NOSUB<dd>Report only success or fail in<i><a href="regexec.html">regexec()</a></i>.<dt>REG_NEWLINE<dd>Change the handling of newline.</dl><p>Values for the<i>eflags</i>parameter to the<i><a href="regexec.html">regexec()</a></i>function:<dl compact><dt>REG_NOTBOL<dd>The circumflex character (^),when taken as a special character, will not matchthe beginning of<i>string</i>.<dt>REG_NOTEOL<dd>The dollar sign ($),when taken as a special character, will not matchthe end of<i>string</i>.</dl><p>The following constants are defined as error return values:<dl compact><dt>REG_NOMATCH<dd><i><a href="regexec.html">regexec()</a></i>failed to match.<dt>REG_BADPAT<dd>Invalid regular expression.<dt>REG_ECOLLATE<dd>Invalid collating element referenced.<dt>REG_ECTYPE<dd>Invalid character class type referenced.<dt>REG_EESCAPE<dd>Trailing \ in pattern.<dt>REG_ESUBREG<dd>Number in \<i>digit</i> invalid or in error.<dt>REG_EBRACK<dd>[ ] imbalance.<dt>REG_EPAREN<dd>\( \) or ( ) imbalance.<dt>REG_EBRACE<dd>\{ \} imbalance.<dt>REG_BADBR<dd>Content of \{ \} invalid:not a number,number too large, more than two numbers, firstlarger than second.<dt>REG_ERANGE<dd>Invalid endpoint in range expression.<dt>REG_ESPACE<dd>Out of memory.<dt>REG_BADRPT<dd>?, * or + not preceded by valid regular expression.<dt>REG_ENOSYS<dd>The implementation does not support the function.</dl><p>The following are declared as functions and may also be declared as macros.Function prototypes must be provided for use with an ISO Ccompiler.<pre><code>int    <a href="regcomp.html">regcomp</a>(regex_t *, const char *, int);int    <a href="regexec.html">regexec</a>(const regex_t *, const char *, size_t, regmatch_t[], int);size_t <a href="regerror.html">regerror</a>(int, const regex_t *, char *, size_t);void   <a href="regfree.html">regfree</a>(regex_t *);</code></pre><p>The implementation may define additional macros or constantsusing names beginning with REG_.</blockquote><h4><a name = "tag_000_008_036">&nbsp;</a>APPLICATION USAGE</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_037">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>None.</blockquote><h4><a name = "tag_000_008_038">&nbsp;</a>SEE ALSO</h4><blockquote><i><a href="regcomp.html">regcomp()</a></i>,the <b>XCU</b> specification.</blockquote><hr size=2 noshade><center><font size=2>UNIX &reg; is a registered Trademark of The Open Group.<br>Copyright &copy; 1997 The Open Group<br> [ <a href="../index.html">Main Index</a> | <a href="../xshix.html">XSH</a> | <a href="../xcuix.html">XCU</a> | <a href="../xbdix.html">XBD</a> | <a href="../cursesix.html">XCURSES</a> | <a href="../xnsix.html">XNS</a> ]</font></center><hr size=2 noshade></body></html>
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