kMaxRegexpOp      163 third_party/re2/re2/parse.cc const RegexpOp kLeftParen = static_cast<RegexpOp>(kMaxRegexpOp+1);
kMaxRegexpOp      164 third_party/re2/re2/parse.cc const RegexpOp kVerticalBar = static_cast<RegexpOp>(kMaxRegexpOp+2);