How to search exact strings

I am part of the moderators team for a forum served by discourse.
I have noted several post by different people with the exact same wording and slightly out of context of the specific issue.

Now I am suspecting some account may have been hacked and as a first measure would like to find all Topics who have the exact same string (not in the title, but in any of the posts inside a topic)

how can u do that? searching for “exact string in topic content” does not work unfortunately

It should work as per: