C ++标准库不支持使用char16_t或char32_t Unicode的正则表达式.有解决此问题的建议，但在C ++ 20中却没有:

The C++ standard library does not support regex with char16_t or char32_t Unicode. There is a proposal to address this, but it is not in C++20: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2015/p0169r0.html