Index: /wordpress-trunk/wp-includes/classes.php
===================================================================
--- /wordpress-trunk/wp-includes/classes.php	(revision 9472)
+++ /wordpress-trunk/wp-includes/classes.php	(working copy)
@@ -207,8 +207,8 @@
 					$request_match = $req_uri . '/' . $request;
 				}
 
-				if (preg_match("!^$match!", $request_match, $matches) ||
-					preg_match("!^$match!", urldecode($request_match), $matches)) {
+				if (preg_match("!^$match!i", $request_match, $matches) ||
+					preg_match("!^$match!i", urldecode($request_match), $matches)) {
 					// Got a match.
 					$this->matched_rule = $match;