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<title>POSIX Compatible C API's</title>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_regex.ref.posix"></a><a class="link" href="posix.html" title="POSIX Compatible C API's">POSIX Compatible C API's</a>
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</h3></div></div></div>
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<div class="note"><table border="0" summary="Note">
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<tr>
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
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<th align="left">Note</th>
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</tr>
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<tr><td align="left" valign="top"><p>
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this is an abridged reference to the POSIX API functions, these are provided
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for compatibility with other libraries, rather than as an API to be used
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in new code (unless you need access from a language other than C++). This
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version of these functions should also happily coexist with other versions,
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as the names used are macros that expand to the actual function names.
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</p></td></tr>
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</table></div>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">cregex</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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</pre>
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<p>
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or:
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</p>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">h</span><span class="special">></span>
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</pre>
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<p>
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The following functions are available for users who need a POSIX compatible
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C library, they are available in both Unicode and narrow character versions,
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the standard POSIX API names are macros that expand to one version or the
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other depending upon whether UNICODE is defined or not.
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</p>
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<div class="important"><table border="0" summary="Important">
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<tr>
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="../../../../../../doc/src/images/important.png"></td>
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<th align="left">Important</th>
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</tr>
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<tr><td align="left" valign="top"><p>
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Note that all the symbols defined here are enclosed inside namespace <code class="computeroutput"><span class="identifier">boost</span></code> when used in C++ programs, unless
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you use <code class="computeroutput"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">regex</span><span class="special">.</span><span class="identifier">h</span><span class="special">></span></code>
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instead - in which case the symbols are still defined in namespace boost,
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but are made available in the global namespace as well.
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</p></td></tr>
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</table></div>
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<p>
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The functions are defined as:
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</p>
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<pre class="programlisting"><span class="keyword">extern</span> <span class="string">"C"</span> <span class="special">{</span>
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<span class="keyword">struct</span> <span class="identifier">regex_tA</span><span class="special">;</span>
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<span class="keyword">struct</span> <span class="identifier">regex_tW</span><span class="special">;</span>
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<span class="keyword">int</span> <span class="identifier">regcompA</span><span class="special">(</span><span class="identifier">regex_tA</span><span class="special">*,</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*,</span> <span class="keyword">int</span><span class="special">);</span>
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<span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">regerrorA</span><span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">regex_tA</span><span class="special">*,</span> <span class="keyword">char</span><span class="special">*,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">);</span>
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<span class="keyword">int</span> <span class="identifier">regexecA</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">regex_tA</span><span class="special">*,</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">regmatch_t</span><span class="special">*,</span> <span class="keyword">int</span><span class="special">);</span>
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<span class="keyword">void</span> <span class="identifier">regfreeA</span><span class="special">(</span><span class="identifier">regex_tA</span><span class="special">*);</span>
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<span class="keyword">int</span> <span class="identifier">regcompW</span><span class="special">(</span><span class="identifier">regex_tW</span><span class="special">*,</span> <span class="keyword">const</span> <span class="keyword">wchar_t</span><span class="special">*,</span> <span class="keyword">int</span><span class="special">);</span>
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<span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">regerrorW</span><span class="special">(</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">regex_tW</span><span class="special">*,</span> <span class="keyword">wchar_t</span><span class="special">*,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">);</span>
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<span class="keyword">int</span> <span class="identifier">regexecW</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">regex_tW</span><span class="special">*,</span> <span class="keyword">const</span> <span class="keyword">wchar_t</span><span class="special">*,</span> <span class="keyword">unsigned</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">regmatch_t</span><span class="special">*,</span> <span class="keyword">int</span><span class="special">);</span>
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<span class="keyword">void</span> <span class="identifier">regfreeW</span><span class="special">(</span><span class="identifier">regex_tW</span><span class="special">*);</span>
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<span class="preprocessor">#ifdef</span> <span class="identifier">UNICODE</span>
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<span class="preprocessor">#define</span> <span class="identifier">regcomp</span> <span class="identifier">regcompW</span>
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<span class="preprocessor">#define</span> <span class="identifier">regerror</span> <span class="identifier">regerrorW</span>
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<span class="preprocessor">#define</span> <span class="identifier">regexec</span> <span class="identifier">regexecW</span>
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<span class="preprocessor">#define</span> <span class="identifier">regfree</span> <span class="identifier">regfreeW</span>
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<span class="preprocessor">#define</span> <span class="identifier">regex_t</span> <span class="identifier">regex_tW</span>
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<span class="preprocessor">#else</span>
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<span class="preprocessor">#define</span> <span class="identifier">regcomp</span> <span class="identifier">regcompA</span>
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<span class="preprocessor">#define</span> <span class="identifier">regerror</span> <span class="identifier">regerrorA</span>
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<span class="preprocessor">#define</span> <span class="identifier">regexec</span> <span class="identifier">regexecA</span>
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<span class="preprocessor">#define</span> <span class="identifier">regfree</span> <span class="identifier">regfreeA</span>
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<span class="preprocessor">#define</span> <span class="identifier">regex_t</span> <span class="identifier">regex_tA</span>
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<span class="preprocessor">#endif</span>
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<span class="special">}</span>
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</pre>
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<p>
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All the functions operate on structure regex_t, which exposes two public
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members:
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</p>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Member
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</p>
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</th>
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<th>
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<p>
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Meaning
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="keyword">unsigned</span> <span class="keyword">int</span>
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<span class="identifier">re_nsub</span></code>
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</p>
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</td>
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<td>
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<p>
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This is filled in by <code class="computeroutput"><span class="identifier">regcomp</span></code>
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and indicates the number of sub-expressions contained in the regular
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expression.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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<code class="computeroutput"><span class="keyword">const</span> <span class="identifier">TCHAR</span><span class="special">*</span> <span class="identifier">re_endp</span></code>
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</p>
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</td>
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<td>
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<p>
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Points to the end of the expression to compile when the flag REG_PEND
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is set.
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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<div class="note"><table border="0" summary="Note">
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<tr>
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<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
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<th align="left">Note</th>
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</tr>
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<tr><td align="left" valign="top"><p>
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<code class="computeroutput"><span class="identifier">regex_t</span></code> is actually a
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<code class="computeroutput"><span class="preprocessor">#define</span></code> - it is either
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<code class="computeroutput"><span class="identifier">regex_tA</span></code> or <code class="computeroutput"><span class="identifier">regex_tW</span></code> depending upon whether <code class="computeroutput"><span class="identifier">UNICODE</span></code> is defined or not, <code class="computeroutput"><span class="identifier">TCHAR</span></code> is either <code class="computeroutput"><span class="keyword">char</span></code>
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or <code class="computeroutput"><span class="keyword">wchar_t</span></code> again depending
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upon the macro <code class="computeroutput"><span class="identifier">UNICODE</span></code>.
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</p></td></tr>
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</table></div>
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<a name="regcomp"></a><h5>
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<a name="boost_regex.ref.posix.h0"></a>
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<span class="phrase"><a name="boost_regex.ref.posix.regcomp"></a></span><a class="link" href="posix.html#boost_regex.ref.posix.regcomp">regcomp</a>
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</h5>
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<p>
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<code class="computeroutput"><span class="identifier">regcomp</span></code> takes a pointer to
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a <code class="computeroutput"><span class="identifier">regex_t</span></code>, a pointer to the
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expression to compile and a flags parameter which can be a combination of:
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</p>
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<div class="informaltable"><table class="table">
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<colgroup>
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<col>
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<col>
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</colgroup>
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<thead><tr>
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<th>
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<p>
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Flag
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</p>
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</th>
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<th>
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<p>
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Meaning
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</p>
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</th>
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</tr></thead>
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<tbody>
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<tr>
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<td>
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<p>
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REG_EXTENDED
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</p>
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</td>
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<td>
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<p>
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Compiles modern regular expressions. Equivalent to <code class="computeroutput"><span class="identifier">regbase</span><span class="special">::</span><span class="identifier">char_classes</span> <span class="special">|</span>
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<span class="identifier">regbase</span><span class="special">::</span><span class="identifier">intervals</span> <span class="special">|</span>
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<span class="identifier">regbase</span><span class="special">::</span><span class="identifier">bk_refs</span></code>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_BASIC
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</p>
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</td>
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<td>
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<p>
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Compiles basic (obsolete) regular expression syntax. Equivalent
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to <code class="computeroutput"><span class="identifier">regbase</span><span class="special">::</span><span class="identifier">char_classes</span> <span class="special">|</span>
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<span class="identifier">regbase</span><span class="special">::</span><span class="identifier">intervals</span> <span class="special">|</span>
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<span class="identifier">regbase</span><span class="special">::</span><span class="identifier">limited_ops</span> <span class="special">|</span>
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<span class="identifier">regbase</span><span class="special">::</span><span class="identifier">bk_braces</span> <span class="special">|</span>
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<span class="identifier">regbase</span><span class="special">::</span><span class="identifier">bk_parens</span> <span class="special">|</span>
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<span class="identifier">regbase</span><span class="special">::</span><span class="identifier">bk_refs</span></code>.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_NOSPEC
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</p>
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</td>
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<td>
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<p>
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All characters are ordinary, the expression is a literal string.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_ICASE
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</p>
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</td>
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<td>
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<p>
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Compiles for matching that ignores character case.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_NOSUB
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</p>
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</td>
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<td>
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<p>
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Has no effect in this library.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_NEWLINE
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</p>
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</td>
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<td>
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<p>
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When this flag is set a dot does not match the newline character.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_PEND
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</p>
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</td>
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<td>
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<p>
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When this flag is set the re_endp parameter of the regex_t structure
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must point to the end of the regular expression to compile.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_NOCOLLATE
|
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</p>
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</td>
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<td>
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<p>
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When this flag is set then locale dependent collation for character
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ranges is turned off.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_ESCAPE_IN_LISTS
|
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</p>
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</td>
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<td>
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<p>
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When this flag is set, then escape sequences are permitted in bracket
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expressions (character sets).
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_NEWLINE_ALT
|
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</p>
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</td>
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<td>
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<p>
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When this flag is set then the newline character is equivalent
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to the alternation operator |.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_PERL
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</p>
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</td>
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<td>
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<p>
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Compiles Perl like regular expressions.
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_AWK
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</p>
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</td>
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<td>
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<p>
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A shortcut for awk-like behavior: <code class="computeroutput"><span class="identifier">REG_EXTENDED</span>
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<span class="special">|</span> <span class="identifier">REG_ESCAPE_IN_LISTS</span></code>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_GREP
|
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</p>
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</td>
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<td>
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<p>
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A shortcut for grep like behavior: <code class="computeroutput"><span class="identifier">REG_BASIC</span>
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<span class="special">|</span> <span class="identifier">REG_NEWLINE_ALT</span></code>
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</p>
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</td>
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</tr>
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<tr>
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<td>
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<p>
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REG_EGREP
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</p>
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</td>
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<td>
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<p>
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A shortcut for egrep like behavior: <code class="computeroutput"><span class="identifier">REG_EXTENDED</span>
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<span class="special">|</span> <span class="identifier">REG_NEWLINE_ALT</span></code>
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</p>
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</td>
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</tr>
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</tbody>
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</table></div>
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<a name="regerror"></a><h5>
|
|
<a name="boost_regex.ref.posix.h1"></a>
|
|
<span class="phrase"><a name="boost_regex.ref.posix.regerror"></a></span><a class="link" href="posix.html#boost_regex.ref.posix.regerror">regerror</a>
|
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</h5>
|
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<p>
|
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regerror takes the following parameters, it maps an error code to a human
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readable string:
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</p>
|
|
<div class="informaltable"><table class="table">
|
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<colgroup>
|
|
<col>
|
|
<col>
|
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</colgroup>
|
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<thead><tr>
|
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<th>
|
|
<p>
|
|
Parameter
|
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</p>
|
|
</th>
|
|
<th>
|
|
<p>
|
|
Meaning
|
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</p>
|
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</th>
|
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</tr></thead>
|
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<tbody>
|
|
<tr>
|
|
<td>
|
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<p>
|
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int code
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|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
The error code.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
const regex_t* e
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
The regular expression (can be null).
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
char* buf
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
The buffer to fill in with the error message.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
unsigned int buf_size
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
The length of buf.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table></div>
|
|
<p>
|
|
If the error code is OR'ed with REG_ITOA then the message that results is
|
|
the printable name of the code rather than a message, for example "REG_BADPAT".
|
|
If the code is REG_ATIO then e must not be null and e->re_pend must point
|
|
to the printable name of an error code, the return value is then the value
|
|
of the error code. For any other value of code, the return value is the number
|
|
of characters in the error message, if the return value is greater than or
|
|
equal to buf_size then regerror will have to be called again with a larger
|
|
buffer.
|
|
</p>
|
|
<a name="regexec"></a><h5>
|
|
<a name="boost_regex.ref.posix.h2"></a>
|
|
<span class="phrase"><a name="boost_regex.ref.posix.regexec"></a></span><a class="link" href="posix.html#boost_regex.ref.posix.regexec">regexec</a>
|
|
</h5>
|
|
<p>
|
|
regexec finds the first occurrence of expression e within string buf. If
|
|
len is non-zero then <span class="emphasis"><em>*m</em></span> is filled in with what matched
|
|
the regular expression, m[0] contains what matched the whole string, m[1]
|
|
the first sub-expression etc, see regmatch_t in the header file declaration
|
|
for more details. The eflags parameter can be a combination of:
|
|
</p>
|
|
<div class="informaltable"><table class="table">
|
|
<colgroup>
|
|
<col>
|
|
<col>
|
|
</colgroup>
|
|
<thead><tr>
|
|
<th>
|
|
<p>
|
|
Flag
|
|
</p>
|
|
</th>
|
|
<th>
|
|
<p>
|
|
Meaning
|
|
</p>
|
|
</th>
|
|
</tr></thead>
|
|
<tbody>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
REG_NOTBOL
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
Parameter buf does not represent the start of a line.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
REG_NOTEOL
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
Parameter buf does not terminate at the end of a line.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
<tr>
|
|
<td>
|
|
<p>
|
|
REG_STARTEND
|
|
</p>
|
|
</td>
|
|
<td>
|
|
<p>
|
|
The string searched starts at buf + pmatch[0].rm_so and ends at
|
|
buf + pmatch[0].rm_eo.
|
|
</p>
|
|
</td>
|
|
</tr>
|
|
</tbody>
|
|
</table></div>
|
|
<a name="regfree"></a><h5>
|
|
<a name="boost_regex.ref.posix.h3"></a>
|
|
<span class="phrase"><a name="boost_regex.ref.posix.regfree"></a></span><a class="link" href="posix.html#boost_regex.ref.posix.regfree">regfree</a>
|
|
</h5>
|
|
<p>
|
|
<code class="computeroutput"><span class="identifier">regfree</span></code> frees all the memory
|
|
that was allocated by regcomp.
|
|
</p>
|
|
</div>
|
|
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
|
<td align="left"></td>
|
|
<td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p>
|
|
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
|
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
|
|
</p>
|
|
</div></td>
|
|
</tr></table>
|
|
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