If you're using Perl v5.14+, you could use the r (for return the modified string) modifier in a substitution:

use strict;
use warnings;

my %hash = map { $_ => 1 } qw/987-665-888 456-123-000 000-000-000 123-
+456-789/;
print "$_\n" for sort { $a =~ s/-//gr <=> $b =~ s/-//gr } keys %hash;
[download]

Output:

000-000-000
123-456-789
456-123-000
987-665-888
[download]

Hope this helps!

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