This should do the job: https://hn.algolia.io/#!/comment/forever/prefix/0/patio11

Not exactly, tptacek is right; there is no simple way to find all items containing "patio11" not being written by "patio11" (both the text and the author name are indexed). Handling the "NOT" operator is pretty tricky as soon as you want to retrieve relevant results from the first keystroke in a few milliseconds (your query can match all documents).

Sorted by date, that just gives me a list of patio11 comments (with our patio11 mentions at the top).