2003-05-17 11:55:51 +00:00
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<title>Boost.Regex: Standards Conformance</title>
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<TABLE id="Table1" cellSpacing="1" cellPadding="1" width="100%" border="0">
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<TR>
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<td valign="top" width="300">
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2004-10-05 15:45:52 +00:00
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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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2003-05-17 11:55:51 +00:00
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</td>
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<TD width="353">
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<H1 align="center">Boost.Regex</H1>
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<H2 align="center">Standards Conformance</H2>
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</TD>
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<td width="50">
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<h3><a href="index.html"><img height="45" width="43" alt="Boost.Regex Index" src="uarrow.gif" border="0"></a></h3>
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</TR>
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</TABLE>
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</P>
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<HR>
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<H3>C++</H3>
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<P>Boost.regex is intended to conform to the <A href="http://anubis.dkuug.dk/jtc1/sc22/wg21/docs/papers/2003/n1429.htm">
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regular expression standardization proposal</A>, which will appear in a
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future C++ standard technical report (and hopefully in a future version of the
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standard). Currently there are some differences in how the regular
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expression traits classes are defined, these will be fixed in a future release.</P>
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<H3>ECMAScript / JavaScript</H3>
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<P>All of the ECMAScript regular expression syntax features are supported, except
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that:</P>
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<P>Negated class escapes (\S, \D and \W) are not permitted inside character class
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definitions ( [...] ).</P>
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<P>The escape sequence \u matches any upper case character (the same as
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[[:upper:]]) rather than a Unicode escape sequence; use \x{DDDD} for
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Unicode escape sequences.</P>
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<H3>Perl</H3>
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<P>Almost all Perl features are supported, except for:</P>
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<P>\N{name} Use [[:name:]] instead.</P>
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<P>\pP and \PP</P>
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<P>(?imsx-imsx)</P>
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<P>(?<=pattern)</P>
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<P>(?<!pattern)</P>
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<P>(?{code})</P>
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<P>(??{code})</P>
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<P>(?(condition)yes-pattern) and (?(condition)yes-pattern|no-pattern)</P>
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<P>These embarrassments / limitations will be removed in due course, mainly
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dependent upon user demand.</P>
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<H3>POSIX</H3>
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<P>All the POSIX basic and extended regular expression features are supported,
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except that:</P>
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<P>No character collating names are recognized except those specified in the POSIX
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standard for the C locale, unless they are explicitly registered with the
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traits class.</P>
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<P>Character equivalence classes ( [[=a=]] etc) are probably buggy except on
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Win32. Implementing this feature requires knowledge of the format of the
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string sort keys produced by the system; if you need this, and the default
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implementation doesn't work on your platform, then you will need to supply a
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custom traits class.</P>
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<HR>
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<p>Revised
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->
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2003-10-24 10:51:38 +00:00
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24 Oct 2003
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<!--webbot bot="Timestamp" endspan i-checksum="39359" --></p>
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<p><i><EFBFBD> Copyright John Maddock 1998-
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<!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%Y" startspan -->
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2003<!--webbot bot="Timestamp" endspan i-checksum="39359" --></i></p>
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<P><I>Use, modification and distribution are subject to the Boost Software License,
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Version 1.0. (See accompanying file <A href="../../../LICENSE_1_0.txt">LICENSE_1_0.txt</A>
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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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2003-05-17 11:55:51 +00:00
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