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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Unicode and Boost.Regex</title>
<title> Unicode and Boost.Regex</title>
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</div>
<div class="section" lang="en">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="boost_regex.unicode"></a><a href="unicode.html" title="Unicode and Boost.Regex"> Unicode and Boost.Regex</a>
</h2></div></div></div>
<a name="boost_regex.unicode"></a><a href="unicode.html" title=" Unicode and Boost.Regex"> Unicode and Boost.Regex</a></h2></div></div></div>
<p>
There are two ways to use Boost.Regex with Unicode strings:
</p>
<a name="boost_regex.unicode.rely_on_wchar_t"></a><h5>
<a name="id492534"></a>
<a name="boost_regex.unicode.rely_on_wchar_t"></a><h4>
<a name="id458749"></a>
<a href="unicode.html#boost_regex.unicode.rely_on_wchar_t">Rely on wchar_t</a>
</h5>
</h4>
<p>
If your platform's <code class="computeroutput"><span class="keyword">wchar_t</span></code> type
If your platform's <tt class="computeroutput"><span class="keyword">wchar_t</span></tt> type
can hold Unicode strings, and your platform's C/C++ runtime correctly handles
wide character constants (when passed to <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">iswspace</span></code>
<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">iswlower</span></code> etc), then you can use <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">wregex</span></code>
wide character constants (when passed to <tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">iswspace</span></tt>
<tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">iswlower</span></tt> etc), then you can use <tt class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">wregex</span></tt>
to process Unicode. However, there are several disadvantages to this approach:
</p>
<div class="itemizedlist"><ul type="disc">
<li>
It's not portable: there's no guarantee on the width of <code class="computeroutput"><span class="keyword">wchar_t</span></code>,
It's not portable: there's no guarantee on the width of <tt class="computeroutput"><span class="keyword">wchar_t</span></tt>,
or even whether the runtime treats wide characters as Unicode at all, most
Windows compilers do so, but many Unix systems do not.
</li>
<li>
There's no support for Unicode-specific character classes: <code class="computeroutput"><span class="special">[[:</span><span class="identifier">Nd</span><span class="special">:]]</span></code>,
<code class="computeroutput"><span class="special">[[:</span><span class="identifier">Po</span><span class="special">:]]</span></code> etc.
There's no support for Unicode-specific character classes: <tt class="computeroutput"><span class="special">[[:</span><span class="identifier">Nd</span><span class="special">:]]</span></tt>,
<tt class="computeroutput"><span class="special">[[:</span><span class="identifier">Po</span><span class="special">:]]</span></tt> etc.
</li>
<li>
You can only search strings that are encoded as sequences of wide characters,
it is not possible to search UTF-8, or even UTF-16 on many platforms.
</li>
</ul></div>
<a name="boost_regex.unicode.use_a_unicode_aware_regular_expression_type_"></a><h5>
<a name="id492718"></a>
<a name="boost_regex.unicode.use_a_unicode_aware_regular_expression_type_"></a><h4>
<a name="id458932"></a>
<a href="unicode.html#boost_regex.unicode.use_a_unicode_aware_regular_expression_type_">Use
a Unicode Aware Regular Expression Type.</a>
</h5>
</h4>
<p>
If you have the <a href="http://www.ibm.com/software/globalization/icu/" target="_top">ICU
library</a>, then Boost.Regex can be <a href="install.html#boost_regex.install.building_with_unicode_and_icu_support">configured
to make use of it</a>, and provide a distinct regular expression type (boost::u32regex),
that supports both Unicode specific character properties, and the searching
of text that is encoded in either UTF-8, UTF-16, or UTF-32. See: <a href="ref/non_std_strings/icu.html" title="Working With Unicode and ICU String Types">ICU
of text that is encoded in either UTF-8, UTF-16, or UTF-32. See: <a href="ref/non_std_strings/icu.html" title=" Working With
Unicode and ICU String Types">ICU
string class support</a>.
</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"><small>Copyright <20> 2007 John Maddock</small></td>
<td align="right"><div class="copyright-footer"><small>Copyright <20> 2007 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></small></div></td>
</tr></table>
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