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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.
old thread, but I'd recommend hiding the actual regex in a variable that suggests it's regex so nobody ever has to guess what it is. If you know it's a "regular expression", then yes it's readable.
absoultely, 100% - very readable imho