Global alnum
boost::xpressive::alnum — Matches an alpha-numeric character. 
 
Synopsis
Description
The regex traits are used to determine which characters are alpha-numeric. To match any character that is not alpha-numeric, use ~alnum.
| ![[Note]](../../../../doc/src/images/note.png) | Note | 
| alnum is equivalent to /[[:alnum:]]/ in perl. ~alnum is equivalent to /[[:^alnum:]]/ in perl.  |