.HTAccess problem!

[bncplix]

Ok, so I have a catch-all subdomain setup. This points to /sub to be handled by the index php file there. In that file atm, all I currently do is print out "The subdomain you are currently using is:" then the subdomain, as a way to test.

 

I also have a .htaccess in my root, that contains this:

RewriteEngine on
RewriteBase / 
Options -MultiViews
RewriteRule ^([0-9a-zA-Z-]+)/?$ shortlink.php?short=$1 [L]

This rewrites anything on the domain to the shortlink file to be handled. Such as www.mydomain.com/MyLink

 

That works perfectly, but with that htaccess file, if i try to access a subdomain, it no longer prints out which subdomain i am on, instead it says:

Not Found

The requested URL /shortlink.php was not found on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

 

I have been looking around everywhere on how to make a rewrite cond that will only run the rewrite rule if IT IS NOT on a subdomain, but i just cant find it anywhere! Can anybody give me a little help?