https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67403
Mikhail Maltsev <miyuki at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |miyuki at gcc dot gnu.org --- Comment #3 from Mikhail Maltsev <miyuki at gcc dot gnu.org> --- Here is rather detailed explanation from Jonathan Wakely (he is the maintainer of libstdc++): https://stackoverflow.com/questions/12530406/is-gcc-4-7-and-gcc-4-8-buggy-about-regular-expressions/12665408