#usr/bin/perl -w

use strict;
my $zip = "12345";
my @accepted = qw (12390 12351 12345 01241);
foreach my $thiszip (@accepted){
    print "Matched ", cmpZIP ($zip, $thiszip), "\n";
}

sub cmpZIP {
    my ($zip_a,$zip_b) = @_;
    if ($zip_a eq $zip_b){return 5}
    
    my ($ichi, $ni, $san)=unpack ("a3aa",$zip_a);
    my ($ein, $zwei ,$drei)=unpack ("a3aa",$zip_b);
    
    if (($ichi eq $ein)&&($zwei eq $ni)) {return 4}
    if ($ichi eq $ein) {return 3}
    return 0;
}