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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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benchmarking is the only way to find that out.
I think a solution for maximum performance would look quite different and would be significantlyfaster (10x to 20x faster i would totally guess). Usually regular expressions are only faster if your programming language is not so performance (like early perl/php implementations I guess).