When I tried it, it worked at least as well as regexpon (same goes for eval instead of evalon), which made me think the docs were leaving out the basic case for the two flags I tested.
In Directory Opus 13.10 Build 9004, regexp and eval seem to work.
I guess there is a difference between
Set QUICKFILTERFLAGS=set,eval
vs
Set QUICKFILTERFLAGS=evalon
and
Set QUICKFILTERFLAGS=clear,eval
vs
Set QUICKFILTERFLAGS=evaloff
when both evalon and evaloff alone toggle.
Are there implicit states I'm not expecting, like "neither on nor off" and "both on and off"?
Otherwise, I would think that Set QUICKFILTERFLAGS=evaloff and Set QUICKFILTERFLAGS=clear,evalon have the same result, and everything could be used like the first flags: {flag} to toggle, set,{flag} to turn on, clear,{flag} to turn off.
That's why I thought it was weird that the basic case (which I now know is actually not a valid command, despite working) was omitted, and only specifically the cases for turning the flags on and off were mentioned.
When I had trouble getting the on and off cases to work (linked post), I thought the docs were incomplete for sure 