How to end such a regular expression?

Question

Regular Expressions

Here I barely wrote the rule for htaccess. With all the examples inside at the link
https://regex101.com/r/0EgPDP/2

A list of what I could not write:

1. Should not start with admin and public. At the same time, public* with endings must be available, for example, publication.
   
2. The first group may optionally end with a slash / if the second group is missing.
   

Answer 1

https://regex101.com/r/0EgPDP/3