code: def t_identifier(self, s):
          r' [$a-z_A-Z/\//][\w/\.\$:#]*'
          self.rv.append(Token(type='IDENTIFIER', attr=s)f t_identifier(self, s):
          r' [$a-z_A-Z/\//][\w/\.\$:#]*'
          self.rv.append(Token(type='IDENTIFIER', attr=s))
docs: r' [$a-z_A-Z/\//][\w/\.\$:#]*