@ElMiko - Stoked to hear about reducing your workflow time - I find exactly the same, it takes me a tiny fraction of what it used to take apply the book editing changes I do (x2 for every time it used to crash

). And I bet you still haven't found half the things we put in there yet..
I can replicate your F&R issue, I will take a look into it. (BTW this sounds exactly like the comment exaltedwombat made a few pages ago, so it is nice to be able to group those two items together with a repro case now).
Edit: Ok, the problem will be with trying a replace with either of lookahead or lookbehind assertions in your regex. A fix that was put in for issue 1486 is incompatible with either of these. I think we are going to have to remove that 1486 fix and find another way to do it...