if ps[4] != "" {
		err = errors.New("invalid ARN - unsupported account-id field")
		return
	}

	res := strings.SplitN(ps[5], "/", 2)
	if len(res) != 2 {
		err = errors.New("invalid ARN - resource does not contain a \"/\"")
		return
	}

	if res[0] != string(arnResourceTypeRole) {
		err = errors.New("invalid ARN: resource type is invalid")
		return
	}

	if !validResourceIDRegex.MatchString(res[1]) {