code: def _naturalize_numbers(self, string):
          
  
          def naturalize_int_match(match):
              return '%08d' % (int(match.group(0)),)
  
          string = re.sub(r'\d+', naturalize_int_match, string)
  
          return string
docs: Makes any integers into very zero-padded numbers.
          e.g. '1' becomes '00000001'.