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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.
You should not convert the stringified result derived from the regex group to integer, because it will truncate leading zeros, giving the wrong results. Not a kata issue nonetheless.
Because not every character is a valid optional nose.