Here's a solution using the so-called Schwartzian transform for sorting the keys (the leading "C" is stripped off, and the the key list is sorted by the number before the dash, and then by the number after the dash: 
#!/usr/bin/perl

use warnings;
use strict;

my %keys;

$keys{'C10'}->{'C10-1'}=1;
$keys{'C10'}->{'C10-2'}=1;
$keys{'C10'}->{'C10-20'}=1;
$keys{'C10'}->{'C10-3'}=1;

$keys{'C200'}->{'C200-1'}=1;
$keys{'C200'}->{'C200-20'}=1;
$keys{'C200'}->{'C200-3'}=1;
$keys{'C200'}->{'C200-21'}=1;

$keys{'C30'}->{'C30-1'}=1;
$keys{'C30'}->{'C30-2'}=1;
$keys{'C30'}->{'C30-30'}=1;
$keys{'C30'}->{'C30-4'}=1; 

sub sorted { 
    return map { $_->[0] }
        sort { 
            $a->[1] <=> $b->[1] ||
            $a->[2] <=> $b->[2]
        } map { [ $_, split("-", substr($_,1)) ] } @_;
}

foreach my $key (sorted(keys %keys)) {
    print "'$key' => ", $keys{$key}, "\n";
    foreach my $subkey (sorted(keys %{$keys{$key}})) {
        print "   '$subkey' => $keys{$key}->{$subkey}\n";
    }
}

[download]

Arjen

In reply to Re: How to sort hash tables alpha-numeric by Aragorn
in thread How to sort hash tables alpha-numeric by juo

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