Loading collection data...
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.
This is real demonstration of the fundamentals
https://regexone.com/
i hope this helps
Falling down the regex documentation on MDN sure was a ride! What I wouldn't give for a flexbox-froggy-esque regex practice game. :D