I found this on accident while discussing at https://de.wikipedia.org/wiki/Wikipedia:Fragen_zur_Wikipedia#Suche_nach_.C3.9F.
- insource:/außer/ returns nothing.
- insource:/au[ß]er/ returns nothing.
- insource:/au[ ß]er/ returns the expected results for "außer".
I have no idea why. What does the space do? I tried other combinations of characters, e.g. [ a], but in most cases this does what I expect. There is something very, very special about the German "ß".
See Also: T87136: ~"daß" should not match "dass"