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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.
Regular expressions are never easy to read. It doesn't mean we can't use them.
For what it's worth, I don't think the author of this solution thinks this is best practice. I assume they just wanted to write it as one regex.