parsing TLD?

For a header record, "Envelope-To: 
someone(_at_)somemachine(_dot_)someplace(_dot_)com",
is it possible to parse someplace.com into the $MATCH variable?

I can't get it anchored on the end, and keep ending up with
somemachine.someplace in $MATCH.

        Thanks,

        John

-- 

John Conover        Tel. 408.370.2688  conover(_at_)rahul(_dot_)net
631 Lamont Ct.      Fax. 408.379.9602  http://www.johncon.com/
Campbell, CA 95008  Cel. 408.772.7733  

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