Ah, sounds like you basically want the opposite of https://github.com/db0/threativore/tree/main/threativore - this bot finds things based on regex matching, and then "reports" it - i.e. report as spam to the moderators/admins. You instead would want it to take a different action - I guess retooting it to you (or I suppose it could also email you a link to the toot).
I think, and keep in mind I haven't ested this, but for a dev, it seems like this is still pretty easy to do by modifying threativore - just change this line here, https://github.com/db0/threativore/blob/main/threativore/threativore.py#L339 from the moderation-reporting call to the "notify me about interesting posts" call.