#!/usr/bin/perl -l
# http://perlmonks.org/?node_id=1178025
use strict;
use warnings;
use Algorithm::Diff qw(traverse_sequences);
while(<DATA>)
{
my ($want, $in) = split;
my @from = split //, $in;
my @to = split //, $want;
my $answer = '';
traverse_sequences( \@from, \@to,
{
MATCH => sub {$answer .= $from[shift()]},
DISCARD_A => sub {$answer .= "-$from[shift()]"},
DISCARD_B => sub {$answer .= "+$to[pop()]"},
} );
$answer =~ s/^(?:[+-]\w)+ | (?:[+-]\w)+$//gx; # strip outer
$answer =~ tr/+-//d; # clean up inner
$answer ||= 'not found';
print "$want in $in is $answer";
}
__DATA__
ABC DFGABCKBG
ABC DFGAXBHCY
ABC DFGAXBHY
ABC DEFGHI
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