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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 regex101.com
Can I get an explanation for this regex?
It says in the description that the empty string is allowed to match.
I think it should be 0|1(01*0)*1)+ , because if put * at the end it will match "" empty string which is wrong.