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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.
Your code doesn't fail on '968345'. It fails on ' 310587 '.
Why are you stripping the strings before checking? Strings with spaces are invalid.
It will also fail when you submit your solution on 'N18345'.
[^05789]does not force the character to be a digit.Could you post your code here?