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16 KiB
HTML
574 lines
16 KiB
HTML
<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Standards Conformance</title>
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<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.79.1">
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<link rel="home" href="../../index.html" title="Boost.Regex 5.1.4">
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<link rel="up" href="../background.html" title="Background Information">
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<link rel="prev" href="performance/section_id4148872883.html" title="Testing leftmost-longest searches (platform = linux, compiler = GNU C++ version 6.3.0)">
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<link rel="next" href="redist.html" title="Redistributables">
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</head>
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<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
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<table cellpadding="2" width="100%"><tr>
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<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td>
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<td align="center"><a href="../../../../../../index.html">Home</a></td>
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<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td>
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<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td>
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<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td>
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<td align="center"><a href="../../../../../../more/index.htm">More</a></td>
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</tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="performance/section_id4148872883.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../background.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="redist.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a>
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</div>
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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.background.standards"></a><a class="link" href="standards.html" title="Standards Conformance">Standards Conformance</a>
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</h3></div></div></div>
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<h5>
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<a name="boost_regex.background.standards.h0"></a>
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<span class="phrase"><a name="boost_regex.background.standards.c"></a></span><a class="link" href="standards.html#boost_regex.background.standards.c">C++</a>
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</h5>
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<p>
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Boost.Regex is intended to conform to the <a href="http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2005/n1836.pdf" target="_top">Technical
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Report on C++ Library Extensions</a>.
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</p>
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<h5>
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<a name="boost_regex.background.standards.h1"></a>
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<span class="phrase"><a name="boost_regex.background.standards.ecmascript_javascript"></a></span><a class="link" href="standards.html#boost_regex.background.standards.ecmascript_javascript">ECMAScript
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/ JavaScript</a>
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</h5>
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<p>
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All of the ECMAScript regular expression syntax features are supported, except
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that:
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</p>
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<p>
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The escape sequence \u matches any upper case character (the same as [[:upper:]])
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rather than a Unicode escape sequence; use \x{DDDD} for Unicode escape sequences.
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</p>
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<h5>
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<a name="boost_regex.background.standards.h2"></a>
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<span class="phrase"><a name="boost_regex.background.standards.perl"></a></span><a class="link" href="standards.html#boost_regex.background.standards.perl">Perl</a>
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</h5>
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<p>
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Almost all Perl features are supported, except for:
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</p>
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<p>
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(?{code}) Not implementable in a compiled strongly typed language.
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</p>
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<p>
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(??{code}) Not implementable in a compiled strongly typed language.
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</p>
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<p>
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(*VERB) The <a href="http://perldoc.perl.org/perlre.html#Special-Backtracking-Control-Verbs" target="_top">backtracking
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control verbs</a> are not recognised or implemented at this time.
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</p>
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<p>
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In addition the following features behave slightly differently from Perl:
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</p>
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<p>
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^ $ \Z These recognise any line termination sequence, and not just \n: see
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the Unicode requirements below.
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</p>
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<h5>
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<a name="boost_regex.background.standards.h3"></a>
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<span class="phrase"><a name="boost_regex.background.standards.posix"></a></span><a class="link" href="standards.html#boost_regex.background.standards.posix">POSIX</a>
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</h5>
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<p>
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All the POSIX basic and extended regular expression features are supported,
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except that:
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</p>
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<p>
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No character collating names are recognized except those specified in the
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POSIX standard for the C locale, unless they are explicitly registered with
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the traits class.
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</p>
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<p>
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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
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a custom traits class.
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</p>
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<h5>
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<a name="boost_regex.background.standards.h4"></a>
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<span class="phrase"><a name="boost_regex.background.standards.unicode"></a></span><a class="link" href="standards.html#boost_regex.background.standards.unicode">Unicode</a>
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</h5>
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<p>
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The following comments refer to <a href="http://unicode.org/reports/tr18/" target="_top">Unicode
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Technical Standard #18: Unicode Regular Expressions version 11</a>.
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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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<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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Item
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</p>
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</th>
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<th>
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<p>
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Feature
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</p>
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</th>
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<th>
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<p>
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Support
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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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1.1
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</p>
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</td>
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<td>
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<p>
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Hex Notation
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</p>
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</td>
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<td>
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<p>
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Yes: use \x{DDDD} to refer to code point UDDDD.
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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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1.2
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</p>
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</td>
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<td>
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<p>
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Character Properties
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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 the names listed under the General Category Property are supported.
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Script names and Other Names are not currently supported.
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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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1.3
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</p>
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</td>
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<td>
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<p>
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Subtraction and Intersection
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</p>
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</td>
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<td>
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<p>
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Indirectly support by forward-lookahead:
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</p>
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<p>
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<code class="computeroutput"><span class="special">(?=[[:</span><span class="identifier">X</span><span class="special">:]])[[:</span><span class="identifier">Y</span><span class="special">:]]</span></code>
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</p>
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<p>
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Gives the intersection of character properties X and Y.
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</p>
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<p>
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<code class="computeroutput"><span class="special">(?![[:</span><span class="identifier">X</span><span class="special">:]])[[:</span><span class="identifier">Y</span><span class="special">:]]</span></code>
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</p>
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<p>
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Gives everything in Y that is not in X (subtraction).
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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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1.4
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</p>
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</td>
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<td>
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<p>
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Simple Word Boundaries
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</p>
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</td>
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<td>
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<p>
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Conforming: non-spacing marks are included in the set of word characters.
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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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1.5
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</p>
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</td>
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<td>
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<p>
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Caseless Matching
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</p>
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</td>
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<td>
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<p>
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Supported, note that at this level, case transformations are 1:1,
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many to many case folding operations are not supported (for example
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"ß" to "SS").
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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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1.6
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</p>
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</td>
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<td>
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<p>
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Line Boundaries
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</p>
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</td>
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<td>
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<p>
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Supported, except that "." matches only one character
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of "\r\n". Other than that word boundaries match correctly;
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including not matching in the middle of a "\r\n" sequence.
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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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1.7
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</p>
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</td>
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<td>
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<p>
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Code Points
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</p>
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</td>
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<td>
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<p>
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Supported: provided you use the u32* algorithms, then UTF-8, UTF-16
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and UTF-32 are all treated as sequences of 32-bit code points.
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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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2.1
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</p>
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</td>
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<td>
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<p>
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Canonical Equivalence
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</p>
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</td>
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<td>
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<p>
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Not supported: it is up to the user of the library to convert all
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text into the same canonical form as the regular 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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2.2
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</p>
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</td>
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<td>
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<p>
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Default Grapheme Clusters
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</p>
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</td>
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<td>
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<p>
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Not supported.
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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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2.3Default Word Boundaries
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</p>
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</td>
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<td>
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<p>
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Not supported.
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</p>
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</td>
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<td class="auto-generated"> </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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2.4
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</p>
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</td>
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<td>
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<p>
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Default Loose Matches
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</p>
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</td>
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<td>
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<p>
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Not Supported.
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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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2.5
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</p>
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</td>
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<td>
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<p>
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Named Properties
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</p>
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</td>
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<td>
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<p>
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Supported: the expression "[[:name:]]" or \N{name} matches
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the named character "name".
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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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2.6
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</p>
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</td>
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<td>
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<p>
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Wildcard properties
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</p>
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</td>
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<td>
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<p>
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Not Supported.
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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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3.1
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</p>
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</td>
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<td>
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<p>
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Tailored Punctuation.
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</p>
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</td>
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<td>
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<p>
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Not Supported.
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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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3.2
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</p>
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</td>
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<td>
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<p>
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Tailored Grapheme Clusters
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</p>
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</td>
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<td>
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<p>
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Not Supported.
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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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3.3
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</p>
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</td>
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<td>
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<p>
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Tailored Word Boundaries.
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</p>
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</td>
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<td>
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<p>
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Not Supported.
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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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3.4
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</p>
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</td>
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<td>
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<p>
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Tailored Loose Matches
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</p>
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</td>
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<td>
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<p>
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Partial support: [[=c=]] matches characters with the same primary
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equivalence class as "c".
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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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3.5
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</p>
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</td>
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<td>
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<p>
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Tailored Ranges
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</p>
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</td>
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<td>
|
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<p>
|
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Supported: [a-b] matches any character that collates in the range
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a to b, when the expression is constructed with the collate flag
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set.
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</p>
|
||
</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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3.6
|
||
</p>
|
||
</td>
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<td>
|
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<p>
|
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Context Matches
|
||
</p>
|
||
</td>
|
||
<td>
|
||
<p>
|
||
Not Supported.
|
||
</p>
|
||
</td>
|
||
</tr>
|
||
<tr>
|
||
<td>
|
||
<p>
|
||
3.7
|
||
</p>
|
||
</td>
|
||
<td>
|
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<p>
|
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Incremental Matches
|
||
</p>
|
||
</td>
|
||
<td>
|
||
<p>
|
||
Supported: pass the flag <code class="computeroutput"><span class="identifier">match_partial</span></code>
|
||
to the regex algorithms.
|
||
</p>
|
||
</td>
|
||
</tr>
|
||
<tr>
|
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<td>
|
||
<p>
|
||
3.8
|
||
</p>
|
||
</td>
|
||
<td>
|
||
<p>
|
||
Unicode Set Sharing
|
||
</p>
|
||
</td>
|
||
<td>
|
||
<p>
|
||
Not Supported.
|
||
</p>
|
||
</td>
|
||
</tr>
|
||
<tr>
|
||
<td>
|
||
<p>
|
||
3.9
|
||
</p>
|
||
</td>
|
||
<td>
|
||
<p>
|
||
Possible Match Sets
|
||
</p>
|
||
</td>
|
||
<td>
|
||
<p>
|
||
Not supported, however this information is used internally to optimise
|
||
the matching of regular expressions, and return quickly if no match
|
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is possible.
|
||
</p>
|
||
</td>
|
||
</tr>
|
||
<tr>
|
||
<td>
|
||
<p>
|
||
3.10
|
||
</p>
|
||
</td>
|
||
<td>
|
||
<p>
|
||
Folded Matching
|
||
</p>
|
||
</td>
|
||
<td>
|
||
<p>
|
||
Partial Support: It is possible to achieve a similar effect by
|
||
using a custom regular expression traits class.
|
||
</p>
|
||
</td>
|
||
</tr>
|
||
<tr>
|
||
<td>
|
||
<p>
|
||
3.11
|
||
</p>
|
||
</td>
|
||
<td>
|
||
<p>
|
||
Custom Submatch Evaluation
|
||
</p>
|
||
</td>
|
||
<td>
|
||
<p>
|
||
Not Supported.
|
||
</p>
|
||
</td>
|
||
</tr>
|
||
</tbody>
|
||
</table></div>
|
||
</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>
|
||
<hr>
|
||
<div class="spirit-nav">
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