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<title>Boost.Regex: regex_error</title>
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<h3><a href="../../../index.htm"><img height="86" width="277" alt="C++ Boost" src="../../../boost.png" border="0"></a></h3>
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<h1 align="center">Boost.Regex</h1>
<h2 align="center">class regex_error</h2>
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<h3>Synopsis</h3>
<p>#include <<a href="../../../boost/regex/pattern_except.hpp">boost/pattern_except.hpp</a>></p>
<p>The class <code>regex_error</code> defines the type of objects thrown as
exceptions to report errors during the conversion from a string representing a
regular expression to a finite state machine. </p>
<pre>
<b>namespace</b> boost{
<b>class</b> regex_error : <b>public</b> std::runtime_error
{
<b>public</b>:
<b>explicit</b> regex_error(<b>const</b> std::string& s, <a href="error_type.html">regex_constants::error_type err</a>, std::ptrdiff_t pos);
<b>explicit</b> regex_error(<a href="error_type.html">boost::regex_constants::error_type err</a>);
<a href="error_type.html">boost::regex_constants::error_type</a> code()<b>const</b>;
std::ptrdiff_t position()<b>const</b>;
};
typedef regex_error bad_pattern; // for backwards compatibility
typedef regex_error bad_expression; // for backwards compatibility
} // namespace boost
</pre>
<h3>Description</h3>
<pre>
regex_error(<b>const</b> std::string& s, <a href="error_type.html">regex_constants::error_type</a> err, std::ptrdiff_t pos);
regex_error(<a href="error_type.html">boost::regex_constants::error_type err</a>);</pre>
<p><b>Effects:</b> Constructs an object of class <code>regex_error</code>.</p>
<pre>
<a href="error_type.html">boost::regex_constants::error_type</a> code()<b>const</b>;</pre>
<p><b>Effects:</b> returns the error code that represents parsing error that occurred.</p>
<pre>
std::ptrdiff_t position()<b>const</b>; </pre>
<p><b>Effects:</b> returns the location in the expression where parsing stopped.</p>
<P>Footnotes: the choice of <code>std::runtime_error</code> as the base class for <code>
regex_error</code> is moot; depending upon how the library is used
exceptions may be either logic errors (programmer supplied expressions) or run
time errors (user supplied expressions). The library previously used <code>bad_pattern</code>
and <code>bad_expression</code> for errors, these have been replaced by the
single class <code>regex_error</code> to keep the library in synchronization
with the standardization proposal.</P>
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<p>Revised
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
24 June 2004
<!--webbot bot="Timestamp" endspan i-checksum="39359" --></p>
<p><i> Copyright John Maddock 1998-
<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%Y" startspan --> 2004<!--webbot bot="Timestamp" endspan i-checksum="39359" --></i></p>
<P><I>Use, modification and distribution are subject to the Boost Software License,
Version 1.0. (See accompanying file <A href="../../../LICENSE_1_0.txt">LICENSE_1_0.txt</A>
or copy at <A href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</A>)</I></P>
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