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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.
Your test case has been addeded (by me). Enjoy
I havn't been very active here at Codewars recently, but checking the tests I'm doing, that error happens when the variable's value is not an instance of RegExp.