Currently, it is possible to do an AND filter in journalctl. It would be great to have other operators as well. In particular, negating operators would be great, to eg, silence (in journalctl output) a particularly noisy unit when investigating an issue. In other words, being able to say journalctl --follow --system --not --unit iamnoisy.service (or some other equivalent invocation) would be very useful.

In more general terms, having AND, OR, NOT and grouping of the operations would be awesome.