Hi Monks, I am trying to write a function that takes a string argument $str of the form shown below (letter + weight) and need to generate all combinations with certain restrictions; for example, no repeating numbers. I also need a perlish way to move the letter $firstLetter with the largest weight into first position. The order of the other substrings do not matter. As a secondary restriction, I also want to ensure that the combination contains the substring $substring. So, for this particular $str example, [ c?6, b?2, a%3, a?1] is a valid combination.

Thank you very much for your help

use strict;
use Math::Combinatorics;

my $firstLetter="c";
my $str="a?1,a?2,a%3,b?2,b?3,b%5,c%4,c%5,c?6,d%2";
my $substring = "a?,b%,c?";


my @combos = Math::Combinatorics::combine(4,split ",",$str);

foreach my $combo (@combos) {


    ## check if numbers are all unique
    my $hash = {};
    my ($count) = grep { ++$hash->{$_} > 1 } map { (split '')[2] } @$c
+ombo;
    next if defined $count;


    ## place $firstLetter with largest weight in first position
    
    
    ## ensure that substring strings are contained within the combinat
+ion

}

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In reply to Combinations with constraints by Anonymous Monk

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