Thank you, Ohrenkino and Crissov, for the quick help.
I forgot to notice: my goal is not the performance. As usually i rename 1 album at once, so despite the 650 actions in the group, the speed is right, some milliseconds. I am interesting, because i was waiting for some short, elegant solution with a regex switch, as here i got a help ten years ago.
I admit, the termin "Adapt case" regex switch (i mean: checkmark in the programs, not a real switch) i could find in google only in context with JGSoft programs (PowerGREP and EditPad), but there may be some other termin, i think.
The list of terms I expand often (for example today, carillon=harangjáték, at Bizet), so it simply will be easier to create one plus replace action (with duplication of an existing) in the group, than two. Crissov's solution must work, but it is, in my eyes, less transparent (while redacting the new row), than the existing 2-actions variant, because there are lines, like this:
1=\b(Allegro ([Aa]ss(ai|ez)|([Dd]i )*[Mm]olto))\b
But it seems by Ohrenkino, there is no such regex switch:
By the way, the action group is here.