Method simple

extern/re2/re2/regexp.h:325–325

  RegexpOp op() { return static_cast<RegexpOp>(op_); }
  int nsub() { return nsub_; }
  bool simple() { return simple_ != 0; }
  ParseFlags parse_flags() { return static_cast<ParseFlags>(parse_flags_); }
  int Ref();  // For testing.