Couldn't you do something along the lines of 
(\.\w\w\w?)+

[download]
to make it match any set of two or three word characters beginning with a dot? I would think this solution would take care of most of the problems, though it is an ugly hack.

In reply to Re: regex to extract fully-qualified domain name from full URL by Wodin
in thread regex to extract fully-qualified domain name from full URL by AddamB

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