REGEX Woes - Help appreciated

[rattencreep]

Hello!

my setup is docker, traefik and authentik, all working very well. I am running a Collabora Online Development Edition container, which has an admin interface at https://sub.domain.tld/browser/dist/admin/admin.html I want to protect via authentik. To not interfere with the CODE functions I thought to put REGEX in the providers unauthenticated paths to exclude everything except https://sub.domain.tld/browser/dist/admin/admin.html. But I can't get it working. Here is my REGEX try:

^https://sub.domain.tld/(?!/browser/dist/admin/admin.html$).*

I am grateful for any advice.