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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.
The 'r' character is Python's raw string notation, which will treat escaped characters properly to form a regex pattern. ;)
HI, what does that "r" character do at the beginning of the pattern? thanks