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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.
not an issue. You're supposed to write a regular expression, not to hack the tests to use simple arithmetic.
I think you haven't known what RegEx is...
Your code being wrong is not a kata issue, read this: https://docs.codewars.com/training/troubleshooting/