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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.
No tests of unmatched brackets like such: "]["
Solution like this which does not try to deal with non-bracket characters should not pass.
This is a duplicate of https://www.codewars.com/kata/valid-parentheses and many other similar katas.
Needs random tests.
In the EBNF you use parentheses (
()), but elsewhere it's square brackets ([]). You might want to correct that.