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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.
What I don't get is calling 'Singleton' from within 'Singleton'. Obviously this is allowed so we have some kind of closure and that's why __instance keeps the instance value like a ststic.
Regex was my initial thought but I didn't know how it will handle string with regex symbols like '.', '+', etc.
Any clues about that?