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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.
First note:
Descriptions says: "No whitespaces / underscore". If we look at some solutions from Best Practices, we will see that them regular expressions will not pass the test if something similar is added to the tests: "PassW0r_d".
Second note:
On the use of the term 'Not very secure'. Thus, seems to be supposed to check at least one of the allowed characters, because 333333333333, which passes the test, cannot be called NOT secure enough.
If you look at all tests, the solution is very simple and does not quite correspond to the description and in my opinion does not match 5 kyu in my opinion.