Lynn Allan wrote:
The subsequent searches give valid information about the length and position, but other fields in the smatch:what variable seem invalid. regex_search( altDow.substr(32), what, rex) regex_search( altDow.substr(45), what, rex)
Watch out! altDow.substr(32) is returning a temporary string object. After regex_search returns, the temporary is destroyed and the results object is left holding iterators into a destroyed string.
Regardless, I'm unclear how to tell which of the "groups" of subexpressions was "hit". With boost::regex there was a way to loop thru the boolean field: what[i].matched and see what "hit", but I am not seeing a comparable accessor.
Xpressive is no different that Boost.Regex in this regard. what[i].matched is correct. -- Eric Niebler Boost Consulting www.boost-consulting.com