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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.
Same here... I iterated through each one. This is pretty.
That way of re-arranging using the zip-function is quite clever, would not have thought about that!
In my opinion, they are worth it. They become much easier to read once you know a few concepts, and they are very powerful even when you are no expert at regex. Downside is that they are not maintainable for someone who hasn't spent at least a few days practicing them. I recommend this resource: https://www.regular-expressions.info/, it is much more in depth than the many online regex-tutorials, that are just way too shallow in my opinion (you can find the book of the website's author if you search it)