code: def t_escaped_TAB_CHAR(self, t):
          r'\x74'  # 't'
          t.lexer.pop_state()
          t.value = unichr(0x0009)
          return f t_escaped_TAB_CHAR(self, t):
          r'\x74'  # 't'
          t.lexer.pop_state()
          t.value = unichr(0x0009)
          return t
docs: r'\x74