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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.
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The question mark before the end of the string doesn't make that group non-greedy, it only states that the group is optional (the same as {0,1} quantifier).