Themes: Improve RegExp pattern for search.

* The replacement of spaces is now done globally.
* The search term is now escaped for RegExp meta characters.

props westonruter for the hint.
fixes #27479.
Built from https://develop.svn.wordpress.org/trunk@27649


git-svn-id: http://core.svn.wordpress.org/trunk@27492 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/js/theme.js

@@ -179,11 +179,12 @@ themes.Collection = Backbone.Collection.extend({
 		// Start with a full collection
 		this.reset( themes.data.themes, { silent: true } );
 
-		// The RegExp object to match
-		//
+		// Escape the term string for RegExp meta characters
+		term = term.replace( /[-\/\\^$*+?.()|[\]{}]/g, '\\$&' );
+
 		// Consider spaces as word delimiters and match the whole string
 		// so matching terms can be combined
-		term = term.replace( ' ', ')(?=.*' );
+		term = term.replace( / /g, ')(?=.*' );
 		match = new RegExp( '^(?=.*' + term + ').+', 'i' );
 
 		// Find results