Method FoldsASCII

extern/re2/re2/regexp.cc:834–836

Does the character class behave the same on A-Z as on a-z?

// Does the character class behave the same on A-Z as on a-z?
bool CharClassBuilder::FoldsASCII() {
  return ((upper_ ^ lower_) & AlphaMask) == 0;
}

CharClassBuilder* CharClassBuilder::Copy() {
  CharClassBuilder* cc = new CharClassBuilder;