Circular chess - why not?
"A major goal for Perl 6 is to break backward compatibility in the areas that need it, and no area needs it more than regular expression syntax. So prepare yourselves for a certain amount of future shock when you read Apocalypse 5, because we're going to propose a radical re-design of regex metacharacters. We think you'll like it. Eventually."- use Perl: Perl 6 answers.