[snip]
I receive posts from an open moderated forum that need to be filtered
for 
urls. I've successfully managed to trap any entires that use 'http://'
'www.' 
with the standard '.com' '.org', '.net' endings.

What I need to do is to strip the prefix part ('http:// or http://www.
or 
'www') and suffix as well (the .com, etc.) I need only the domain name.
I 
can't seem to trim away the suffix part.
[/snip]

Have you looked at http://us3.php.net/manual/en/function.parse-url.php

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