in reply to Re^2: Finding nested directories from a string list.
in thread Finding nested directories from a string list.

As was stated elsewhere in this thread, you can sort on length instead. The parent will always sort before the child: 
my @sorted_paths = sort 
                   { length($a) <=> length($b) } 
                   keys %paths;

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-QM
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Quantum Mechanics: The dreams stuff is made of

In Section Seekers of Perl Wisdom