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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.
It all depends on what the requirements are.
For small input sizes Linq and regular expression based solution is likely great.
For large input size and/or performance sensitive pieces of code, custom parsing might be required.