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.
Why do I always forget about regular expressions? :(
I have absolutely no idea either and looking at the solutions didn't help either :(
Description could be a bit clearer about minus decimal numbers.