Bob Kline wrote:
#include
int main() { boost::wregex e(L"^[^\\s]( ?([^\\s]+ ?)*[^\\s])?$"); boost::wcmatch m; boost::regex_match(L"codeine phosphate ", m, e); return 0; }
[...]
I'm pretty sure that the expression is boiled down to the least ambiguous form (without changing the semantics). In plain English, it's looking for strings that have no leading or trailing whitespace, and for which any internal whitespace runs are comprised solely of a single blank character.
I've no idea which part of the regexp causes the library to give up, but isn't there a much simpler reformulation: ^[^\s]+( [^\s]+)*$ that achieves the same result? In addition to running at all, it should also run much faster. :-) Unless I've missed something, of course.