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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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If you're going to forbid certain things, it helps solvers immensely if the tests give accurate failure messages.
When I have a literal string in my solution, I get "Error: You cannot use general math operators, or regex", which points in a totally wrong direction if I also have "&" in it. Because "&" might fall under "math operators such as
[+-*/%]".Be precise, both in specifications and in error messages. "such as" and "some parts" have no place in specifications.
This has been done. It was called "additionless addition" or something.