code: def t_escaped_FORM_FEED_CHAR(self, t):
          r'\x66'  # 'f'
          t.lexer.pop_state()
          t.value = unichr(0x000c)
          return f t_escaped_FORM_FEED_CHAR(self, t):
          r'\x66'  # 'f'
          t.lexer.pop_state()
          t.value = unichr(0x000c)
          return t
docs: r'\x66