I miss this function from reddit. I used it often to find if a post has already been submitted. Also, it was useful to see what else was posted from this domain. I hope some day this will come to Lemmy.
Examples:
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I would like if URLs were SEO friendly and you could search by community from a search engine like
site:instance.com/community_name
This should have been the way it was implemented from the beginning until the built-in search was half as good as the search engine.