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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.
On one hand it's the temptation and ease of regex, on the other is the temptation of writing a beautifully structured interpreter toolchain
Read it here: https://www.codewars.com/kata/595a1cd5ae807b48d7000034
Those 2 are three different elements. There is only one {2,3}.