Block all ads except all Google ads?

Hi folks,

I always set on the URL Filter of the Web-Proxy the URL Category "Suspicious" to be filtered.

Now a customer complained that no google ads and sponsored links are displayed when he searches with google. That's because in this category web ads are filtered.

So I'm about to allow these ads, but i still want all other ads to be filtered.

How do I do this? I think I have to put something in "Always allow these URL's/Sites". But wthat to put there? ( I'm not down with this regex expressions, is there any lecture about it?)

Thanks, Albeck.