你不能.

GCC 6.2 对 C++17 的支持是实验性的，它从字面上看，为什么标题是这样排列的.

GCC 6.2's support for C++17 is experimental, which is literally why the headers are arranged like this.

要是他们当初为 std::regex 这样做就好了！这是一份礼物.

If only they'd done this for std::regex back in the day! It's a gift.

_{https://gcc.gnu.org/projects/cxx-status.html#cxx1z}