Despite asking for URL matching, I think you are looking for a domain name matcher. Try something like: 
use Regexp::Common;
if ($name =~ /^$RE{net}{domain}\z/) { ... }

[download]
Note that there is no requirement for a webserver to be on a domain starting with www.

In reply to Re: regex of a url by ysth
in thread regex of a url by Anonymous Monk

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