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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.
No. The requirement is to 'filter out the strings'. We don't really care if the left overs are numbers, objects, or anything else for that matter. Just don't include the strings!
You aren't using
matchproperly:matchis a prototype method of String, not RegExp.Besides, this is not an issue.