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print if !/cr\d$/ && $_ = (split)[3];

if (!/cr\d$/ && s/^confederation-as-router:\W+\d\W+\d\W//) {
   ...
}

if (!/cr\d$/ && ($host, $last) = (split)[0,3]) {
   print $last if $host eq 'confederation-as-router:';
}