JQuery :: Match Links To More Than One Possible Domain?

Here's my situation: I'd like to have links to my organization's sites open in the current window, but links to other sites open in a new window. The tricky part is that not all of our sites are on the same (or even similar) domains.This works just fine for matching foo.org:

$(".article a[href*='http:']").not("[href*=foo.org']").attr('target','_blank').addClass('external');

I'd like to widen this so that links to foo.org, bar.net and whatever,com all open in the current window. It seems like everything I try won't work because I can only match all instead of any.