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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.
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This is an example of why you can't use a regex simply like this to search for a substring. You need to mind the syntax of the regex if you're going to use a regex this way.