Global _w
boost::xpressive::_w — Matches a word character. 
 
Synopsis
Description
'_w' matches a single word character. The regex traits are used to determine which characters are word characters. Use ~_w to match a character that is not a word character.
| ![[Note]](../../../../doc/src/images/note.png) | Note | 
| _w is like \w in perl. ~_w is like \W in perl.  |