(Apologies if this has already been requested, it’s a tricky one to search for.)
Slack has an awesome feature where you can set highlight words which trigger a notification. I think that would be incredibly useful.
Would it be tricky to impliment?
AI-generated summary
Users discuss implementing a feature for notifications based on ‘highlight’ words, similar to Slack’s functionality. HAWK suggests it would be useful and asks if it’s feasible. zogstrip notes that the necessary hooks exist for a plugin to detect posts containing specified highlight words and trigger notifications. codinghorror adds that a related feature — saved searches that run periodically and email results — already exists and could be extended. The thread implies interest in expanding notification capabilities beyond current saved searches to include real-time keyword alerts. codinghorror also references a prior question from @pfaffman, suggesting ongoing community interest in this feature. The discussion remains open-ended, with no official implementation confirmed.
I believe you have all the hooks available to do that in a plugin. Listen for post_created and post_updated and generate notifications whenever the raw contains one of the highlighted words.
The hardest part will probably be the UI 
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Another form of this is the “saved search” where a search is performed every (x) days or hours, and any new matches for the search are sent via email.
You can see this on eBay and the like.
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Yes, I believe @pfaffman was asking about this recently as well.
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