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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.
but your solution is pretty too
This comment is hidden because it contains spoiler information about the solution
(deleted)
Look again if you're still interested. The regex solution (in python) is rather simple. Feel free to upvote it :-)
What language are you looking at?
To answer your question, yes, lots of people.