Or (usually) preferrably 
foreach my $key (sort keys %dbm) {
     print map "$_\n", split /\0/, $dbm{$key};
}

[download]
(You have a typo: $dbm{key} is missing a sigil.)

Makeshifts last the longest.

In reply to Re^2: Splitting a hash by Aristotle
in thread Splitting a hash by sulfericacid

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