https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63631
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
Severity|major |normal
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
words_begin->str().c_str() returns a dangling pointer, because
words_begin->str() returns a temporary that immediately goes out of scope.
This means your regex_match() call fills the match_results object with pointers
into a deallocated string
