Just to add the bug URL in the commit http://dev.jquery.com/ticket/5505

Author: Batiste Bieler

src/attributes.js

@@ -70,6 +70,7 @@ jQuery.fn.extend({
 			// carriage return and tab should be replaced with a single space
 			// http://www.w3.org/TR/html401/types.html#type-cdata
 			className = className.replace(/[\n\t]/g, " ");
+
 			if ( className.indexOf( searchTerm ) > -1 ) {
 				return true;
 			}