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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.
Anyway, it's available since Node 12, so unfortunately it's not on Codewars at the moment :(
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/matchAll
Read this, especially 6th bullet point.
matchAllis not supported in Node 10, which is used by Codewars.