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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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I think regular expressions are not the appropriate tool for this.
Can somebody help me with finding a solution for the same kata but the criteria is different? The criteria changed from 'at least one time' to 'only one time'