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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.
Nice solution, but Imho I've made a bit better one.
You run regex twice for each iteration.
Checkout mine solution. It uses only onre regex per cycle and compares string length change.