validateNumberWildcards(string) {
        const firstIndex = string.indexOf('*');
        if (firstIndex !== -1) {
            return (string.indexOf('*', firstIndex + 1) === -1);
        }
        return true;
    }
_validator.validateNumberWildcards - check if string has multiple
  wildcards
    @param {string} string - string to check for multiple wildcards
    @return {boolean} - whether more than one wildcard in string