code: def regex_to_error_msg(regex):
      
      return re.sub('([^\\\\])[()]', '\\1', regex) \
          .replace('[ \t]*$', '') \
          .replace('^', '') \
          .replace('$', '') \
          .replace('[ \t]*', ' ') \
          .replace('[ \t]+', ' ') \
          .replace('[0-9]+', 'X') \
          \
          .replace('\\[', '[') \
          .replace('\\]', ']') \
          .replace('\\(', '(') \
          .replace('\\)', ')') \
          .replace('\\.', '.')
docs: Format a human-readable error message from a regex