def _match_flags(self):
        buf = []
        while self.c != EOF and self.c == self.FLAG:
            if self.c in self.FLAG:
                buf.append(self.c)
            self.consume()
        return ''.join(buf)
dataset/ETHPy150Open SublimeText/VintageEx/vex/parsers/s_cmd.py/SubstituteLexer._match_flags/operator `in` -> `==`