It seems quite simple, if I understand you right, you want to filter out values that don't begin with
http://www.localhost.net or
/.
Maybe this is what you need?
#!/usr/bin/perl -Wl
use strict;
my $my_domain = quotemeta 'http://www.localhost.net';
print for grep /^(?:$my_domain|\/)/,
qw[ /sered/uplink /my/projects/ heh/reg http://www.OtherNetw
+ork.org/network/ http://www.localhost.net/hello ];
perl -e '$,=$",$_=(split/\W/,$^X)[y[eval]]]+--$_],print+just,another,split,hack'er
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