Trying to rewrite slug rule in CPT UI with regex [closed]

am trying to rewrite the slug rule for custom type in the wp-admin interface,with regex (all urls but /kategorya)
but the front is crushing for some reason, how to fix this?

This is an image for how am doing this.
This is the regex (novosti/(?!kategorya)([^/]+)(?:/([0-9]+))?/?$)

thank you