Allow image form my domain only in CKEditor

I customized the great filter in CKEditor to allow only some kind of tag:

    config.allowedContent='img[!src]';

It works, but I also need to limit the src of the img to my domain only: I need something like this 

    config.allowedContent='img[!src=http://mysite.com/images/[1-9][0-9]*/dir/dir/file.jpg]';

Is it possible?