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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.
This is the inverse re.search I was looking for
realy, this is a shorter one, but i think u should read about backtracking in regex engine, it would make your solution a bad one, although it works well!