@xgebi The format used in the extensions system specifically checks against the hostname.
The source code is here: https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/core/url_pattern/url_pattern.h;l=26?q=URLPattern&sq=&ss=chromium%2Fchromium%2Fsrc
@mauve thanks