Rollback worldedit damage

Hello everyone! Recently one of my staff members made a blunder and set a very big area to air by worldedit. I’m using FastAsyncWorldEdit and Prisma. Prisma didn’t detect the worldedit changes by the specific user so I can’t rollback from there.
Solutions?

PS Good thing the server isn’t even out yet lol

Doesn’t worldedit have a //undo command?

Apparently the server crashed, after which //undo isn’t applicable.

If there isn’t anything important there, delete the region and let the server regen it.

Doesn’t worldedit have a command for that? It’s been quite sometime since I ran a server but I have a vague memory of selecting an area running something to regen the selected area…hmm

yeah //regen