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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.
Add comments to the test cases are a good way to know what problem is happening, according to the spec my regex should be working as expected but not sure what I'm missing.