<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> <title>Character Classes that are Always Supported</title> <link rel="stylesheet" href="../../../../../../../doc/src/boostbook.css" type="text/css"> <meta name="generator" content="DocBook XSL Stylesheets V1.74.0"> <link rel="home" href="../../../index.html" title="Boost.Regex"> <link rel="up" href="../character_classes.html" title="Character Class Names"> <link rel="prev" href="../character_classes.html" title="Character Class Names"> <link rel="next" href="optional_char_class_names.html" title="Character classes that are supported by Unicode Regular Expressions"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table cellpadding="2" width="100%"><tr> <td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../../boost.png"></td> <td align="center"><a href="../../../../../../../index.html">Home</a></td> <td align="center"><a href="../../../../../../../libs/libraries.htm">Libraries</a></td> <td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> <td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> <td align="center"><a href="../../../../../../../more/index.htm">More</a></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="../character_classes.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../character_classes.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="optional_char_class_names.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> <div class="section" lang="en"> <div class="titlepage"><div><div><h4 class="title"> <a name="boost_regex.syntax.character_classes.std_char_clases"></a><a class="link" href="std_char_clases.html" title="Character Classes that are Always Supported"> Character Classes that are Always Supported</a> </h4></div></div></div> <p> The following character class names are always supported by Boost.Regex: </p> <div class="informaltable"><table class="table"> <colgroup> <col> <col> <col> </colgroup> <thead><tr> <th> <p> Name </p> </th> <th> <p> POSIX-standard name </p> </th> <th> <p> Description </p> </th> </tr></thead> <tbody> <tr> <td> <p> alnum </p> </td> <td> <p> Yes </p> </td> <td> <p> Any alpha-numeric character. </p> </td> </tr> <tr> <td> <p> alpha </p> </td> <td> <p> Yes </p> </td> <td> <p> Any alphabetic character. </p> </td> </tr> <tr> <td> <p> blank </p> </td> <td> <p> Yes </p> </td> <td> <p> Any whitespace character that is not a line separator. </p> </td> </tr> <tr> <td> <p> cntrl </p> </td> <td> <p> Yes </p> </td> <td> <p> Any control character. </p> </td> </tr> <tr> <td> <p> d </p> </td> <td> <p> No </p> </td> <td> <p> Any decimal digit </p> </td> </tr> <tr> <td> <p> digit </p> </td> <td> <p> Yes </p> </td> <td> <p> Any decimal digit. </p> </td> </tr> <tr> <td> <p> graph </p> </td> <td> <p> Yes </p> </td> <td> <p> Any graphical character. </p> </td> </tr> <tr> <td> <p> l </p> </td> <td> <p> No </p> </td> <td> <p> Any lower case character. </p> </td> </tr> <tr> <td> <p> lower </p> </td> <td> <p> Yes </p> </td> <td> <p> Any lower case character. </p> </td> </tr> <tr> <td> <p> print </p> </td> <td> <p> Yes </p> </td> <td> <p> Any printable character. </p> </td> </tr> <tr> <td> <p> punct </p> </td> <td> <p> Yes </p> </td> <td> <p> Any punctuation character. </p> </td> </tr> <tr> <td> <p> s </p> </td> <td> <p> No </p> </td> <td> <p> Any whitespace character. </p> </td> </tr> <tr> <td> <p> space </p> </td> <td> <p> Yes </p> </td> <td> <p> Any whitespace character. </p> </td> </tr> <tr> <td> <p> unicode </p> </td> <td> <p> No </p> </td> <td> <p> Any extended character whose code point is above 255 in value. </p> </td> </tr> <tr> <td> <p> u </p> </td> <td> <p> No </p> </td> <td> <p> Any upper case character. </p> </td> </tr> <tr> <td> <p> upper </p> </td> <td> <p> Yes </p> </td> <td> <p> Any upper case character. </p> </td> </tr> <tr> <td> <p> w </p> </td> <td> <p> No </p> </td> <td> <p> Any word character (alphanumeric characters plus the underscore). </p> </td> </tr> <tr> <td> <p> word </p> </td> <td> <p> No </p> </td> <td> <p> Any word character (alphanumeric characters plus the underscore). </p> </td> </tr> <tr> <td> <p> xdigit </p> </td> <td> <p> Yes </p> </td> <td> <p> Any hexadecimal digit character. </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 -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> </div></td> </tr></table> <hr> <div class="spirit-nav"> <a accesskey="p" href="../character_classes.html"><img src="../../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../character_classes.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="optional_char_class_names.html"><img src="../../../../../../../doc/src/images/next.png" alt="Next"></a> </div> </body> </html>