Selecting top level domains

[Adam Powell]

Hi there, I wish to write a SELECT statement to process a list of urls
(without the leading http://) to find top level domains, ie those like
www.something.com, www.somethingother.net, and not those with a subdirectory
such as www.something.com/mypage.  What is the syntax of doing this?  I have
tried a few things but cannot get it to work.

Thanks,
Adam