Replace/rename elements on paste/source edit

Hi,

i am working on a project with web CKEditor. I need to replace certain tags. E.g. strong => b. So the only thing i would need is to replace the tag name. I found this solution in the documentation:

var filter = new CKEDITOR.htmlParser.filter( {
    elements: {
        strong: function( element ) {
        element.name = 'b';
        }
    }
} );

var fragment = CKEDITOR.htmlParser.fragment.fromHtml( '<strong>Foo<b>bar!</b></strong>' ),
    writer = new CKEDITOR.htmlParser.basicWriter();
filter.applyTo( fragment );
fragment.writeHtml( writer );
writer.getHtml(); // '<b>Foo<b>bar!</b></b>'

Problem is I cant get it to work in a real editor. here is my approach:

        editor.on('instanceReady', function () {
            var rule = {
                elements: {
                    strong: function (e) {
                        e.name = 'b';
                    }
                }
            };
            editor.dataProcessor.htmlFilter = new CKEDITOR.htmlParser.filter( {
                elements: {
                    strong: function( element ) {
                        element.name = 'b';
                    }
                }
            } );
            editor.dataProcessor.dataFilter = new CKEDITOR.htmlParser.filter({
                elements: {
                    strong: function (element) {
                        element.name = 'b';
                    }
                }
            });
        });

Any ideas?

Jonas