Index: branches/unlabeled/unlabeled-1.4.2/core/kernel/constants.php
===================================================================
diff -u -N -r7652 -r7748
--- branches/unlabeled/unlabeled-1.4.2/core/kernel/constants.php	(.../constants.php)	(revision 7652)
+++ branches/unlabeled/unlabeled-1.4.2/core/kernel/constants.php	(.../constants.php)	(revision 7748)
@@ -45,4 +45,8 @@
 		// don't show debugger buttons on front (if not overrided in "debug.php")
 		safeDefine('DBG_TOOLBAR_BUTTONS', 0);
 	}
+	
+	// common usage regular expressions
+	define('REGEX_EMAIL_USER', '[-a-zA-Z0-9!\#$%&*+\/=?^_`{|}~.]+');
+	define('REGEX_EMAIL_DOMAIN', '[a-zA-Z0-9]{1}[-.a-zA-Z0-9_]*\.[a-zA-Z]{2,6}');
 ?>
\ No newline at end of file