Proper way to lowercase URLs

Hello!
Please help to find solution to lowercase URLs.

Source
https://example.com/category/lApToPs/

Expected target
https://example.com/category/laptops/

The regex I expect to work is:
([A-Z])
\L$1

And it works on regex101, screenshot: https://take.ms/8iFsg

So I create the redirection rule with this regex, only adding slash ‘/’ to make it relative, screenshot: https://take.ms/qdPA6

And that rule doesn’t seem to work.

Thanks!