Re: Finding longest palindrome from a string

[ccn]

sub ccn { local $_ = shift; my @n; for (my $i = 0; $i < length; pos = $i++) { $n[length $&] = $& if /\G(.+).?(??{reverse $1})/; } return @n ? $n[-1] : ''; } sub ccn2 { local ($_, $s) = shift; for (my $i = 0; $i < length; pos = $i++) { $s = $& if /\G(.+).?(??{reverse $1})/ and length($s) < length +($&); } return $s; }

Update: minor bugs fixed

Update2: improved version added