http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52887
--- Comment #25 from David Edelsohn <dje at gcc dot gnu.org> 2012-11-26 02:50:22 UTC --- The instantiations definitely should be in libstdc++-v3/src/c++11/regex.cc in the GCC 4.7 release branch.
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52887
--- Comment #25 from David Edelsohn <dje at gcc dot gnu.org> 2012-11-26 02:50:22 UTC --- The instantiations definitely should be in libstdc++-v3/src/c++11/regex.cc in the GCC 4.7 release branch.