You can negate filters by prepending with -. For example, -JQMIGRATE will exclude messages containing the string “JQMIGRATE”.
Regex filters can also be negated this way. e.g. -/^DevTools/ will exclude messages that begin with “DevTools”.
(Credit goes to Donald Duck, who suggested this in a comment on the chosen answer. I thought it was a far cleaner solution than negative lookaheads, and deserved to be elevated to a top-level answer.)