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Use Algorithm::Diff to show the differences as color-coded HTML between two text sequences.
use Algorithm::Diff qw(traverse_sequences); my ($old, $new) = split /\n--\n/, join "", <DATA>; # get strings $_ = [split /\s+/, $_] for ($old, $new); # turn them into arrayrefs traverse_sequences($old, $new, { MATCH => sub { print "$old->[shift]\n"}, DISCARD_A => sub { print "<font color=red>$old->[shift]</font>\n"}, DISCARD_B => sub { print "<font color=green>$new->[shift,shift]</fon +t>\n"}, }); __END__ We start. Let's begin. This is the old text. Then we end. -- We start. This is the new text. And here's some stuff I added. Then w +e end.
which produces:
We start. <font color=red>Let's</font> <font color=red>begin.</font> This is the <font color=red>old</font> <font color=green>new</font> text. <font color=green>And</font> <font color=green>here's</font> <font color=green>some</font> <font color=green>stuff</font> <font color=green>I</font> <font color=green>added.</font> Then we end.
which results in:
We start. Let's begin. This is the old new text. And here's some stuff I added. Then we end.

In reply to Showing differences between two sequences by merlyn

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

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