Sure. It is still not very polished but the algorithm should be quite optimal..Note that the brackets here are insertions and deletions, not new or common words! If you want this, I would mark these words in a postprocessing step. However, I think this information is not as important as insertions/deletions. They tell you exactly how to transform one string into the other. So I would use different colors for unique or common words. 
my @output;
printDiff($#s1, $#s2);
print join "\n", @output;

sub printDiff {
        my ($i, $j) = @_;
        if ($i > 0 && $j > 0 and $s1[$i] eq $s2[$j]) {
                printDiff($i-1, $j-1);
                $output[0] .= "  " . $s1[$i];
                $output[1] .= "  " . $s1[$i];
        }
        else {
                if ($j > 0 && ($i == 0 || $M[$i][$j-1] >= $M[$i-1][$j]
+)) {
                        printDiff($i, $j-1);
                        $output[1] .= " <" . $s2[$j] . ">";
                }
                elsif ($i > 0 && ($j == 0 || $M[$i][$j-1] < $M[$i-1][$
+j])) {
                        printDiff($i-1, $j);
                        $output[0] .= " [" . $s1[$i] . "]";
                }
        }
}

[download]
  Perlmonks  is  the  best [perl]  community
  Perlmonks  is <one> <of>  the  best  community <of> <perl> <users>

[download]

In reply to Re^3: diff of two strings by lima1
in thread diff of two strings by flaviusm

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.