str::regex 大多未在 gcc 中实现(在撰写本文时).见第 28 节:http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2011

str::regex is mostly not implemented in gcc (at the time of writing). See section 28 at: http://gcc.gnu.org/onlinedocs/libstdc++/manual/status.html#status.iso.2011