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