Isn't URI better in this case? Bigger, but simpler code: 
use URI;
for (URI::->new($conf[1],"http")) {
 my @domain = split /\./, $_->host;
 my $tld = pop @domain;
 my $sld = join ".",@domain;
 my $www = @domain > 2 && $domain[0] eq "www" ? shift @domain : "";
 my $host = join ".",(@domain,$tld);
 print ($_->scheme,$www,$host,$sld,$tld,$_->port);
}

[download]
(this code will work even in weird cases like perfectly valid http://www.ru)
Sorry if my advice was wrong.

In reply to Re: Perl RegEx (url explode) by aitap
in thread Perl RegEx (url explode) by U_nix$_@

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