PrefixSuccessor  2104 third_party/re2/re2/dfa.cc   *max = PrefixSuccessor(*max);
PrefixSuccessor   511 third_party/re2/re2/re2.cc     pmax = PrefixSuccessor(pmax);
PrefixSuccessor   115 third_party/re2/util/util.h extern string PrefixSuccessor(const StringPiece& prefix);