Alternative:

my %counts;
my @commons = grep { ++$counts{$_} == @s }
              map { my %seen; $seen{$_}++ for /./sg; keys %seen } @s;

[download]

or

use List::MoreUtils qw( uniq );
my %counts;
my @commons = grep { ++$counts{$_} == @s } map { uniq /./sg } @s;

[download]

Tested.

In reply to Re: Find characters in ALL strings by ikegami
in thread Find characters in ALL strings by Anonymous Monk

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