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<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>
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<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>
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</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>
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<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>
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</tbody>
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<td align="right"><div class="copyright-footer">Copyright &#169; 1998 -2010 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>)
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