code: def t_star_star(self, s):
          r'\*\*?'
          token_name = "STARSTAR" if len(s) == 2 else 'STAR'
          self.add_token(token_name, sf t_star_star(self, s):
          r'\*\*?'
          token_name = "STARSTAR" if len(s) == 2 else 'STAR'
          self.add_token(token_name, s)
docs: r'\*\*?