code: def elbv2_load_balancer_arn_suffix(self, lookup, default=None):
      
      try:
        elb = self._elbv2_load_balancer(lookup)
        m = re.search(r'.+?(app\/[^\/]+\/[^\/]+)$', elb['LoadBalancerArn'])
        return m.group(1)
      except ClientError:
        return default
docs: Args:
        lookup: the friendly name of the v2 elb to look up
        default: value to return in case of no match
      Returns:
        The shorthand fragment of the ALB's ARN, of the form `app/*/*`