Index: t3lib/cache/frontend/interfaces/interface.t3lib_cache_frontend_frontend.php
===================================================================
--- t3lib/cache/frontend/interfaces/interface.t3lib_cache_frontend_frontend.php	(revision 5209)
+++ t3lib/cache/frontend/interfaces/interface.t3lib_cache_frontend_frontend.php	(working copy)
@@ -43,12 +43,12 @@
 	/**
 	 * Pattern an entry identifer must match.
 	 */
-	const PATTERN_ENTRYIDENTIFIER = '/^[a-zA-Z0-9_%]{1,250}$/';
+	const PATTERN_ENTRYIDENTIFIER = '/^[a-zA-Z0-9_%-]{1,250}$/';
 
 	/**
 	 * Pattern a tag must match.
 	 */
-	const PATTERN_TAG = '/^[a-zA-Z0-9_%]{1,250}$/';
+	const PATTERN_TAG = '/^[a-zA-Z0-9_%-]{1,250}$/';
 
 	/**
 	 * Returns this cache's identifier