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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.
Sample tests pass, empty string is not matched, but I get 12000ms timeout when attempting to send my solution. Had to switch from PHP to JavaScript which is more verbose as to what is wrong. Turns out that with my regex all tests are green, but only about 640 out of 1000 are completed before timeout kicks in.