code: def elbv2_target_group_arn_suffix(self, lookup, default=None):
      
      try:
        client = EFAwsResolver.__CLIENTS['elbv2']
        elbs = client.describe_target_groups(Names=[lookup])
        elb = elbs['TargetGroups'][0]
        m = re.search(r'.+?(targetgroup\/[^\/]+\/[^\/]+)$', elb['TargetGroupArn'])
        return m.group(1)
      except ClientError:
        return default
docs: Args:
        lookup: the friendly name of the v2 elb target group
        default: value to return in case of no match
      Returns:
        The shorthand fragment of the target group's ARN, of the form
        `targetgroup/*/*`