Character Classes that are Always Supported

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#### Character Classes that are Always Supported

The following character class names are always supported by Boost.Regex:

Name | POSIX-standard name | Description
--- | --- | ---
alnum | Yes | Any alpha-numeric character.
alpha | Yes | Any alphabetic character.
blank | Yes | Any whitespace character that is not a line separator.
cntrl | Yes | Any control character.
d | No | Any decimal digit
digit | Yes | Any decimal digit.
graph | Yes | Any graphical character.
l | No | Any lower case character.
lower | Yes | Any lower case character.
print | Yes | Any printable character.
punct | Yes | Any punctuation character.
s | No | Any whitespace character.
space | Yes | Any whitespace character.
unicode | No | Any extended character whose code point is above 255 in value.
u | No | Any upper case character.
upper | Yes | Any upper case character.
w | No | Any word character (alphanumeric characters plus the underscore).
word | No | Any word character (alphanumeric characters plus the underscore).
xdigit | Yes | Any hexadecimal digit character.