https://github.com/google/re2/blob/master/re2/set.h https://github.com/google/re2/blob/master/re2/set.h <-- c++ API https://github.com/google/re2/blob/master/r

https://github.com/google/re2/blob/master/re2/set.h https://github.com/google/re2/blob/master/re2/set.h <-- c++ API https://github.com/google/re2/blob/master/re2/prog.h#L339 https://github.com/google/re2/blob/master/re2/prog.h#L339 <-- c