1<html> 2<head> 3<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 4<title>Unicode regular expression types</title> 5<link rel="stylesheet" href="../../../../../../../../doc/src/boostbook.css" type="text/css"> 6<meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> 7<link rel="home" href="../../../../index.html" title="Boost.Regex 5.1.4"> 8<link rel="up" href="../icu.html" title="Working With Unicode and ICU String Types"> 9<link rel="prev" href="intro.html" title="Introduction to using Regex with ICU"> 10<link rel="next" href="unicode_algo.html" title="Unicode Regular Expression Algorithms"> 11</head> 12<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> 13<table cellpadding="2" width="100%"><tr> 14<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../../boost.png"></td> 15<td align="center"><a href="../../../../../../../../index.html">Home</a></td> 16<td align="center"><a href="../../../../../../../../libs/libraries.htm">Libraries</a></td> 17<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> 18<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> 19<td align="center"><a href="../../../../../../../../more/index.htm">More</a></td> 20</tr></table> 21<hr> 22<div class="spirit-nav"> 23<a accesskey="p" href="intro.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../icu.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="unicode_algo.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 24</div> 25<div class="section"> 26<div class="titlepage"><div><div><h5 class="title"> 27<a name="boost_regex.ref.non_std_strings.icu.unicode_types"></a><a class="link" href="unicode_types.html" title="Unicode regular expression types">Unicode 28 regular expression types</a> 29</h5></div></div></div> 30<p> 31 Header <code class="computeroutput"><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">icu</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span></code> provides a regular expression traits 32 class that handles UTF-32 characters: 33 </p> 34<pre class="programlisting"><span class="keyword">class</span> <span class="identifier">icu_regex_traits</span><span class="special">;</span> 35</pre> 36<p> 37 and a regular expression type based upon that: 38 </p> 39<pre class="programlisting"><span class="keyword">typedef</span> <span class="identifier">basic_regex</span><span class="special"><</span><span class="identifier">UChar32</span><span class="special">,</span><span class="identifier">icu_regex_traits</span><span class="special">></span> <span class="identifier">u32regex</span><span class="special">;</span> 40</pre> 41<p> 42 The type <code class="computeroutput"><span class="identifier">u32regex</span></code> is 43 regular expression type to use for all Unicode regular expressions; internally 44 it uses UTF-32 code points, but can be created from, and used to search, 45 either UTF-8, or UTF-16 encoded strings as well as UTF-32 ones. 46 </p> 47<p> 48 The constructors, and assign member functions of <code class="computeroutput"><span class="identifier">u32regex</span></code>, 49 require UTF-32 encoded strings, but there are a series of overloaded 50 algorithms called <code class="computeroutput"><span class="identifier">make_u32regex</span></code> 51 which allow regular expressions to be created from UTF-8, UTF-16, or 52 UTF-32 encoded strings: 53 </p> 54<pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">class</span> <span class="identifier">InputIterator</span><span class="special">></span> 55<span class="identifier">u32regex</span> <span class="identifier">make_u32regex</span><span class="special">(</span><span class="identifier">InputIterator</span> <span class="identifier">i</span><span class="special">,</span> 56 <span class="identifier">InputIterator</span> <span class="identifier">j</span><span class="special">,</span> 57 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="identifier">opt</span><span class="special">);</span> 58</pre> 59<p> 60 <span class="bold"><strong>Effects</strong></span>: Creates a regular expression 61 object from the iterator sequence [i,j). The character encoding of the 62 sequence is determined based upon sizeof(*i): 1 implies UTF-8, 2 implies 63 UTF-16, and 4 implies UTF-32. 64 </p> 65<pre class="programlisting"><span class="identifier">u32regex</span> <span class="identifier">make_u32regex</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> 66 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="identifier">opt</span> 67 <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">perl</span><span class="special">);</span> 68</pre> 69<p> 70 <span class="bold"><strong>Effects</strong></span>: Creates a regular expression 71 object from the Null-terminated UTF-8 character sequence <span class="emphasis"><em>p</em></span>. 72 </p> 73<pre class="programlisting"><span class="identifier">u32regex</span> <span class="identifier">make_u32regex</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> 74 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="identifier">opt</span> 75 <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">perl</span><span class="special">);</span> 76</pre> 77<p> 78 <span class="bold"><strong>Effects</strong></span>: Creates a regular expression 79 object from the Null-terminated UTF-8 character sequence p. 80 </p> 81<pre class="programlisting"><span class="identifier">u32regex</span> <span class="identifier">make_u32regex</span><span class="special">(</span><span class="keyword">const</span> <span class="keyword">wchar_t</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> 82 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="identifier">opt</span> 83 <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">perl</span><span class="special">);</span> 84</pre> 85<p> 86 <span class="bold"><strong>Effects</strong></span>: Creates a regular expression 87 object from the Null-terminated character sequence p. The character encoding 88 of the sequence is determined based upon sizeof(wchar_t): 1 implies UTF-8, 89 2 implies UTF-16, and 4 implies UTF-32. 90 </p> 91<pre class="programlisting"><span class="identifier">u32regex</span> <span class="identifier">make_u32regex</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">UChar</span><span class="special">*</span> <span class="identifier">p</span><span class="special">,</span> 92 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="identifier">opt</span> 93 <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">perl</span><span class="special">);</span> 94</pre> 95<p> 96 <span class="bold"><strong>Effects</strong></span>: Creates a regular expression 97 object from the Null-terminated UTF-16 character sequence p. 98 </p> 99<pre class="programlisting"><span class="keyword">template</span><span class="special"><</span><span class="keyword">class</span> <span class="identifier">C</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">T</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">A</span><span class="special">></span> 100<span class="identifier">u32regex</span> <span class="identifier">make_u32regex</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span><span class="special"><</span><span class="identifier">C</span><span class="special">,</span> <span class="identifier">T</span><span class="special">,</span> <span class="identifier">A</span><span class="special">>&</span> <span class="identifier">s</span><span class="special">,</span> 101 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="identifier">opt</span> 102 <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">perl</span><span class="special">);</span> 103</pre> 104<p> 105 <span class="bold"><strong>Effects</strong></span>: Creates a regular expression 106 object from the string s. The character encoding of the string is determined 107 based upon sizeof(C): 1 implies UTF-8, 2 implies UTF-16, and 4 implies 108 UTF-32. 109 </p> 110<pre class="programlisting"><span class="identifier">u32regex</span> <span class="identifier">make_u32regex</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">UnicodeString</span><span class="special">&</span> <span class="identifier">s</span><span class="special">,</span> 111 <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">syntax_option_type</span> <span class="identifier">opt</span> 112 <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">regex_constants</span><span class="special">::</span><span class="identifier">perl</span><span class="special">);</span> 113</pre> 114<p> 115 <span class="bold"><strong>Effects</strong></span>: Creates a regular expression 116 object from the UTF-16 encoding string s. 117 </p> 118</div> 119<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> 120<td align="left"></td> 121<td align="right"><div class="copyright-footer">Copyright © 1998-2013 John Maddock<p> 122 Distributed under the Boost Software License, Version 1.0. (See accompanying 123 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>) 124 </p> 125</div></td> 126</tr></table> 127<hr> 128<div class="spirit-nav"> 129<a accesskey="p" href="intro.html"><img src="../../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../icu.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="unicode_algo.html"><img src="../../../../../../../../doc/src/images/next.png" alt="Next"></a> 130</div> 131</body> 132</html> 133
