FYI: This is a C++ template version of compile time regex class.

A 54:47 presentation at CppCon 2018 is worth more than a thousand words...

see https://www.youtube.com/watch?v=QM3W36COnE4

followup CppCon 2019 video at https://www.youtube.com/watch?v=8dKWdJzPwHw

As the above github repo mentions, more info at https://www.compile-time.re/