docstr: We use a callable class to be able to change the ``__repr__``.
code: def __call__(self, inst, attr, value):
      """
      We use a callable class to be able to change the ``__repr__``.
      """
      if not self.match_func(value):
          raise ValueError(
              "'{name}' must match regex {regex!r}"
              " ({value!r} doesn't)".format(
                  name=attr.name, regex=self.regex.pattern, value=value
              ),
              attr,
              self.regex,
              value,
          )
  
imports: from __future__ import absolute_import, division, print_function
  import re
  from ._make import _AndValidator, and_, attrib, attrs
  from .exceptions import NotCallableError
label_desc: Use image node_id 1 for calling the _MatchesReValidator obj's underlying member method code with example usage: obj.__call__(inst, attr, value) without return types