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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.
I genuinely don't know why people care about questions like this. Why would you ever get IP addresses with leading 0s, and why would it be a problem? IP addresses are decimal, not magic. 000 is a perfectly valid octet.
I know i'm a year late on this but really?
You can extend the regex with a literal 1 character change.
This is awful.