code: def t_IDENTIFER(self, t):
          r'\#?[a-zA-Z_][a-zA-Z_0-9]*'
          t.type = SpecParser.reserved.get(t.value, 'IDENTIFIER')
          return f t_IDENTIFER(self, t):
          r'\#?[a-zA-Z_][a-zA-Z_0-9]*'
          t.type = SpecParser.reserved.get(t.value, 'IDENTIFIER')
          return t
docs: r'\#?[a-zA-Z_][a-zA-Z_0-9]*