I like several methods found under natural sort. I'll throw together a new one since I haven't done such in a while: 

    my @array = qw( 2aa 2ba 12kf 9cn 9vn 21sg );
    my @idx= do {
        my @key = @array;
        s[(\d+)][ pack "N", $1 ]ge   for  @key;
        sort { $key[$a] cmp $key[$b] } 0..$#key;
    };
    my @sorted= @array[@idx];
    print "@sorted\n";

[download]
outputs 
2aa 2ba 9cn 9vn 12kf 21sg

[download]

                - tye

In reply to Re: Helping with sorting (natural) by tye
in thread Helping with sorting by kiat

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