I tried it on another PC with another regional setting and it works fine, thank you!
So, there is no way of finding zero or one character into the regular expression? At doesn't do the trick.

I have also encountered an interesting thing. It is not possible to find/replace less/greater than or equal to signs. I found ChrW(8805) and ChrW(8804) for these, but this didn't work either.
Is there any way of looking for these operators?