Yep, I can see your code now.

You have a bug when the string is not empty and there are no matches for the regex. It's likely that if your code is working in VS Code you're just not testing that particular case; try running this:

lowercaseCount("ABC123!@€£#$%^&*()_-+=}{[]|\':;?/>.<,~")

and seeing what happens.

Can you see it when you click on View Solution under my comment?

Can you post your solution code here with a spoiler tag? It's hard to say without seeing your code or knowing what's different between the environments.

But wouldn't it fail the test if one of the numbers was negative?

Aaand I learned a new method. Thank you!