better regex for:

tinymce config update to strip out html comments

document_root/javascript/tinymce.js

 function myCustomCleanup(type, value) {
     switch (type) {
         case "get_from_editor":
-            value = value.replace(/<(!--)([\s\S]*)(--)>/gi, "");
+            value = value.replace(/&lt;![ \r\n\t]*(--([^\-]|[\r\n]|-[^\-])*--[ \r\n\t]*)&gt;/gi, "");
+            value = value.replace(/<![ \r\n\t]*(--([^\-]|[\r\n]|-[^\-])*--[ \r\n\t]*)>/gi, "");
             // Do custom cleanup code here
             break;
     }
@@ -30,5 +31,4 @@ tinyMCE.init({
                    + "-span[style],"
                    + "br",
     cleanup_callback : "myCustomCleanup"
-    
 });
\ No newline at end of file