try this: 
%wordlist= ("unknown", -1);
%lexicon = ("own", 1, "known", 1);


foreach my $q (keys %wordlist)
{
    push (@array, split(//, $q));
    $end = $#array;
    $mover = 1;
    print "\nend : $end \nmove : $mover\n";
    &rightside();
   
    print "$right\n";

    @array = ();
}

sub rightside
{
    last if($mover == 0 or $move == $end);
    if (exists $lexicon{join q(), @array[$mover..$end]})
    {
        $right =  join q(), @array[$mover..$end];
        print "\nright:$right\n";
    }
    else
    {
        $mover++;
        &rightside();
    }
}

[download]
the problem in your code was, you were starting with the smallest string ($mover = 2 and $end = 6)which always return 'own' thats why the output was showing 'own'. Now we are starting with the largest possible string and keeps on reducing the string size till we find the matched string in lexicon or the string length becomes 0.

In reply to Re: Longest String Matching by Rahul6990
in thread Longest String Matching by Dr Manhattan

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