As an exercise, this is actually a good candidate for recursion (we have a recursion fever here these days): (I simplified the question a little bit, and assume we only want full length strings, strings that are formed by all characters in the set, so we can focus on recursion)

use Data::Dumper;

use strict;
use warnings;

my @set = ('1', '2', '3');
my @strings = generate(@set);
print Dumper(\@strings);

sub generate {
    my @set = @_;
    my @strings;
    if ($#set == 0) {
        return ($set[0]);
    } else {
        for (0 .. $#set) {
            my @temp = @set;
            my $t = splice(@temp, $_, 1);
            push @strings, "$t$_" foreach (generate(@temp));
        }
        return @strings;
    }
}

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In reply to Re: character generator by pg
in thread character generator by semio

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