Index: /FCKeditor/trunk/editor/_source/commandclasses/fckjustifycommands.js
===================================================================
--- /FCKeditor/trunk/editor/_source/commandclasses/fckjustifycommands.js	(revision 832)
+++ /FCKeditor/trunk/editor/_source/commandclasses/fckjustifycommands.js	(revision 833)
@@ -49,5 +49,5 @@
 
 	if ( cssClassName && cssClassName.length > 0 )
-		this._CssClassRegex = new RegExp( '(?:^|\s+)' + cssClassName + '(?=$|\s)' ) ;
+		this._CssClassRegex = new RegExp( '(?:^|\\s+)' + cssClassName + '(?=$|\\s)' ) ;
 }