I think have it available as an advanced search filter would be a great addition, because this is not as intuitive as other search filter.
I can mention a category in a post using #categoryname and search for a post in that category by adding #categoryname. I can mention a tag in a post using #tagname and search with #tagname.
I can mention a user in a post using @username and filter the search results with @username. Mentioning a group in a post works with @groupname but searching for it does not work with @groupname. There you have to use group:groupname.
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