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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.
Use regex for simple operations like this is not efficient, you can make some benchmark and check that.
Regex is more expensive that make a simple loop and check character by character.