Thanks very much for your reply and including the workarounds, which I may use in the near future.
What I'd really like to see is something akin to these advanced search mechanisms (preferably the first example from Bleeping Computer) on Groups.io:
That second example is from software that hasn't been updated in over a decade. A site like Groups.io needs to have an advanced search mechanism that's comprehensible to the average (or maybe slightly above average) user that doesn't require workarounds such as the one you've given (and for which I still thank you, very much).
Brian - Windows 10 Home, 64-Bit, Version 1809, Build 17763
The specialist knows more and more about less and less and finally knows everything about nothing.
~ Konrad Lorenz (1903-1989)