How do I add "-complaints" to all urls in a folder

I’m trying to set up a 301 redirect for all urls in a folder so that:

Old: /businesses/telstra
New: /businesses/telstra-complaints

I’ve tried the below screenshot however I am getting an error as it says it creates a redirect loop.

Any help much appreciated!

Correct, that’s a redirect loop. %1-complaints also matches (.*).

Your best option here is to load all of the redirections you want individually rather than using wildcards.

You can bulk import from CSV if you have a lot of them.