Just to make it clear: It does not even support the basic Latin-1 charset correctly. Matching my family-name requires manual intervention. This is sad.
Creator here - can you elaborate? What is your family name? The example in this thread ("Grüneis") matches and displays correctly in all the browsers I've tested.
Are you perhaps trying to use a RegEx feature that is not supported by JS? Currently, RegExr only supports the JS flavour of RegEx.
Forget it, I was not used to JavaScript RegEx. I just looked it up on MDN, and it really defines `\w` to be very limited. Doesn't really make it any better, but whatever.
It seems a very nice regex page otherwise.