Rewriting a Subdomain with mod-rewrite

I have a project that uses the moodle library. I had to change the URL from moodle.example.com to learn.example.com, due to a client request. I thought this would be an easy change, but alas moodle inserts all links and images in with the complete url instead of the relative url. Is it possible using mod-rewrite to point all requests to moodle.example.com to learn.example.com and maintain the query string? Example: I want a request to: `http://moodle.example.com/course/view.php?id=2&topic=1` to go to `http://learn.example.com/course/view.php?id=2&topic=1`. Is this possible? Thanks, Josh