* @param t3lib_cache_backend_Backend Backend to be used for this cache
* @author Robert Lemke <robert@typo3.org>
* @throws InvalidArgumentException if the identifier doesn't match PATTERN_ENTRYIDENTIFIER
+ * @internal
*/
public function __construct($identifier, t3lib_cache_backend_Backend $backend) {
if (!preg_match(self::PATTERN_ENTRYIDENTIFIER, $identifier)) {