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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Thanks!
your elegant solution makes me feel lacking.
This solution doesn't completely work. It returns new ZeroOrMore(null) when given '*' rather than just null. It also doesn't work for a**
test calls parseRegExp("a**") and parseRegExp("(a|)") must return null
oops
You're using the division operator.