Enable special syntax inside the ckeditor

Hi,

I'm creating a web site for the clients to generate reports with dynamic fields via the CKEditor and it removes the dynamic fields automatically.

The syntax of the dynamic field is something like [%fieldname%], I search the web found the following solution, however it still remove the fields and I'm not sure if I have done the right thing.
 

CKEDITOR.editorConfig = function( config ) {

 config.protectedSource.push(/\[%[^%]+%\]/g);
};