Correctly match multiple class names

Assume that el.className === "foo bar"
Assume that your selector is "DIV.foo.bar"

(' ' + el.className + ' ').match(re) will only have one match - " foo " - because the "\\s" trailing character on "foo" prevents " bar " from being matched

EZ fix is just to make sure the trailing whitespace is not consumed by the regex

Sortable.js

@@ -885,7 +885,7 @@
 			selector = selector.split('.');
 
 			var tag = selector.shift().toUpperCase(),
-				re = new RegExp('\\s(' + selector.join('|') + ')\\s', 'g');
+				re = new RegExp('\\s(' + selector.join('|') + ')(?=\\s)', 'g');
 
 			do {
 				if (