How to group things in Looker Studio with "but not" condition?

In Looker Studio I have two types of urls, which I want to group. URLs are categories and articles looking like:

https://example.com/category1/
https://example.com/category1/article_abc
https://example.com/category2/
https://example.com/category2/article_xyz

I thought about using in the CASE a kind of the following expression:

CASE

WHEN URL ENDS_WITH "category1/" THEN "category1 folder"
WHEN URL COMTAINS "category1" BUT NOT ENDS_WITH "category1/" THEN "category1 url"

END

But I'm pretty sure, that this part with BUT NOTwill not work. What is the right way? Should I maybe make USE of REGEX_MATCH? Like

CASE

WHEN REGEXP_MATCH(URL, "category1\/$") THEN "category1 folder" 
WHEN REGEXP_MATCH(URL, "category1\/.+?") THEN "category1 url" 

END

Solution

You may try:

CASE
WHEN REGEXP_CONTAINS(URL, "category1/$") THEN "category1 folder" 
WHEN REGEXP_CONTAINS(URL, "category1/.+") THEN "category1 url"
END