ruzam:

Here's my stab at it. I took out the hash because my method doesn't generate duplicates. Instead I just return the list of results:

#!/usr/bin/perl -w
use strict;
use warnings;

# initial source in sequence order
my $source = 'horse:cow:dog:cat';

function($source);

# and now the results
foreach (function($source)) {
    print "$_\n";
}

# generate array of combinations
sub function {
    my @t = split /:/, shift;
    my @res=(shift @t);
    for my $i (@t) {
        @res=($i, @res, map{$_.':'.$i} @res);
    }
    return @res;
}
[download]

UPDATE: I didn't benchmark it because I've never used that module before. (I'll have to go install it and read up on it.) But I submitted it because I suspect that generating the strings from components might be faster than removing chunks. Any benchmarking ninjas out there wanna help me out?

--roboticus

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