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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.
We have a fun time ¯\(ツ)/¯
what are you guys doin here?
:)
This is a regex expression that indicates which of the characters within the square brackets to split the string by.
he go through all values untill a square root of num as i inderstand
A non-word character: \W
https://docs.oracle.com/javase/6/docs/api/java/util/regex/Pattern.html
"[-_]" what is meaning of this?
[_\-] what that stands for?