Thanks, tachyon.

For my application, I needed maximal runs of identical words between two strings. I'm loose about what comprises a word. For example, for my application "hi-res" is the same as "hires", and punctuation and case don't matter. In the spirit of TIMTOWTDI, here's what I scraped together: 

# FRAGMENT

my $lcs = lcss(standardize($x1), standardize($x2);

sub lcss {
    my ($str1, $str2 ) = @_;
    my @match = ();
    my @longest = ();
    my $i = 0;
    my $seq1 = [split(/\s+/, $str1)];
    my $seq2 = [split (/\s+/, $str2)];
    my $sub = sub {
        @longest = map {$_} @match if (@match >= @longest);
           @match = ();
        };
    traverse_sequences( $seq1, $seq2, {
        MATCH => sub {push(@match, $seq1->[$_[0]]);},
        DISCARD_A => $sub,
        DISCARD_B => $sub,
    });
    my $lcs = join(' ', @longest);
   return $lcs;
}

# lowercase and remove odd characters
sub standardize {
    my ($text) = @_;
    return unless $text;
    $text =~ s/\[.*?\]/ /g;
    $text =~ s/[.,?"':&()!-]/ /g;
    $text =~ s/[^\w ]//g;
    $text =~ s/^\s+//;
    $text =~ s/\s+$//;
    $text =~ s/\s+/ /;
    $text = lc $text;
    return $text;
}

[download]
rkg

In reply to Re: TIMTOWTDI by rkg
in thread LCCS time complexity by rkg

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