ApplyFold         310 third_party/re2/re2/parse.cc   return ApplyFold(f, r);
ApplyFold         181 third_party/re2/re2/prefilter.cc   return ApplyFold(f, r);
ApplyFold          71 third_party/re2/re2/unicode_casefold.h extern Rune ApplyFold(CaseFold *f, Rune r);