#!/usr/bin/perl --
use 5.010000;
use strict;
use warnings;
use autodie;
use Data::Dumper;

Main(@ARGV);

exit(0);

sub Main {
    my $sample = join "\n", qw[ 0 a b c 1 d e f 666 lucy damian larry 
+];
    open my $inMemory, '<', \$sample ;
    my $HoA = ReadADSI( $inMemory);
    close $inMemory;

    print Dumper($HoA);
}

sub ReadADSI {
    my ($fh) = @_;
    my %HoA;
    my $Group = 0;

    while (<$fh>) {
        chomp;
        given ($_) {
            when (/^\d+$/) {
                $Group = $_;
                $HoA{$Group} = [];
            }
            default {
                push @{ $HoA{$Group} }, $_;
            }
        } ## end given
    } ## end while (<$fh>)
    return \%HoA;
} ## end sub ReadADSI

__END__
$VAR1 = {
          '1' => [
                   'd',
                   'e',
                   'f'
                 ],
          '0' => [
                   'a',
                   'b',
                   'c'
                 ],
          '666' => [
                     'lucy',
                     'damian',
                     'larry'
                   ]
        };
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