The lastest push of more-speech allows you to specify regular expression filters for the tabs.

More speech is a tool for deep engagement with nostr. It's not a phone app. Rather it is a desktop app that allows you to see, search, and sort through the global feed of messages coming in on your relays. You can add filters for particular users, or particular threads, to tabs; and create as many tabs as you like. And now, you can add regular expression matching to your tab filters. This allows you to create tabs that search the content within message.

So, for example, perhaps you want to know what people are saying about RFK? You can create a tab to hold RFK messages and then add regular expressions to that tab that will select messages for RFK, and Bobby Kennedy, and Candidate Kennedy, etc.