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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.
you don't need such package, method, or function (regex operation)
Why so? Regular expressions are pretty fast. It completes the tests in just over 2s. Your solution takes 1.7s.
In fact, if you pre-compile the regex, this solution runs just as fast as the one you made.