the following code compares the sequences $s and $t and calculates a 2-dim matrix containing the lengths of matching substrings at the position of the last matching characters. I don't know how to dereference in the nested foreach loop at the bottom in order to go through the matrix scalar by scalar. 
$s = "evian-eauminerale";
$t = "borisvian-ecrivain";

foreach my $i (1..length($s)) {
         foreach my $j (1..length($t)) {
                if (substr($s, $i-1, 1) eq substr($t, $j-1, 1)) {
                   $M[$i][$j] = $M[$i-1][$j-1]+1;
                   $M[$i-1][$j-1] = 0;
                }
        }
}

foreach @array (@M) {
        foreach $element (@array) {
                print "$element ";
        }
        print "\n";
}

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In reply to multi-dimensional arrays, dereferencing by fabalicious

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