class_docstr: :param string: The input string.
  :param re_matches: List of (compiled_re_pattern, re_match) tuples.
  :param group_names_to_nodes: Dictionary mapping all the re group names to the matching Node instances.
code: def _unescape(self, varname, value):
      unwrapper = self._unescape_funcs.get(varname)
      return unwrapper(value) if unwrapper else value
  
imports: from __future__ import unicode_literals
  import re
  from six.moves import range
  from .regex_parser import Any, Sequence, Regex, Variable, Repeat, Lookahead
  from .regex_parser import parse_regex, tokenize_regex
label_desc: Use image node_id 4 for calling the Match obj's underlying member method code with example usage: obj._unescape(varname, value) and returns: unknown