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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.
Possibly you could also compare the regex's test method to an untouched regex's test method?
multipleof3Regex.test === /abc/.test
Was still able to cheat by overriding test method for a regex and then substituting its toString() function to get around that check. Tough one.