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.