Hi @Darren Rose ,
Some special characters aren't included in the search index and therefore aren't searchable.
Refer to: Keyword queries and search conditions for eDiscovery
I tested in my environment and also could not match the special characters.
If an Answer is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.