在采用 tr1 :: regex 或 std :: regex 期间对此可能性的任何讨论，所以我认为没有考虑。事后看来，这当然是我们应该预见的一个陷阱。在我的头顶部，一个重载，需要一个 std :: string&&& 会指示涉及一个临时，需要一个副本。所以我要向标准委员会报告。 （完全公开：我写了Dinkumware实现，这是微软的船）

I don't recall any discussion of this possibility during the adoption of tr1::regex or std::regex, so I think it simply was not considered. In hindsight, it's certainly a trap that we should have foreseen. Off the top of my head, an overload that takes a std::string&& would signal that a temporary is involved, and a copy is needed. So I'd report it to the Standards Committee. (full disclosure: I wrote the Dinkumware implementation, which is what Microsoft ships)