@Steepz did you ever get this to work?

According to the docs, prefix matching should work. That is, if you register an experience to https://example.com it should also be triggered by any https://example.com/* URL. However, so far I could only trigger an app clip by the *exact* URL match and did not succeed getting prefix matching to work. Interestingly, once the app clip is locally cached (i.e. I triggered it once with the exact URL), then also prefix matching is working.