Adamus - 4:59 pm on Feb 10, 2010 (gmt 0)

Alexei, sure, we had to build a filter like this for one of the biggest sites I manage as the GA code was used across two domain names. See the screenshot for the filter: [visualscript.co.uk ]

And this is the text in the Filter Pattern field:
^belfasttelegraph\.co\.uk|\.belfasttelegraph\.co\.uk

Hope this helps.