Say I have two players, "bob" and "prefixbob". If I run "/he search p:bob", then it shows me everything that bob and prefixbob have done. This is especially annoying if prefixbob is much more active, because then it's very difficult to see just what bob has done.

I've also had this issue, except I've only noticed it with suffixes, that is searching for bob will also yield bobsuffix actions, I guess it works both ways.

For a quick workaround you can use "/he search p:bob,!prefixbob", that'll negate all results containing prefixbob as player. But I'd like to see a config value for name completion, or simply detect if there's an exact match for player and only return results for that player.