code: def _process_second_group(self, group):
          
          def _replace_codepoint(match):
              """
              Replace the matched Unicode hex code
              with the corresponding unicode character
              """
              result = self._match_to_int(match)
              if result == -1:
                  return u""
              return gf.safe_unichr(result)
          result = group
          try:
              result = re.sub(self.CODEPOINT_REGEX, _replace_codepoint, result)
          except:
              pass
          return result
docs: Process the second group of a (replace) rule.