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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.
The fact that you found regex less convenient solution in C# doesn't mean that it's true for all languages. Moreover, it is said you should write a fuction for validating inputs, not a regex pattern.
Fixed too.