Do sea cucumbers regenerate?

Recently purchased a piece of liverock and found a pink sea cucumber hiding inside! A nice little find. However, we found my arrow crab, Gibby, eating him. We separated the two, and placed the cucumber in a larger piece of live rock. It looks like the cucumber didnt take his hind end with him, but by the time we got to him he was still alive, just seemingly cut in half. What are his chances of surviving assuming Gibby doesn't find him again?

55g tank

lots of liverock. 4 damsels, 2 blackfoot clowns, couple hermit crabs and snails, 1 arrow crab, 1 scooter blenny, 1 rose pink urchin, 1 black spin urchin, 1 brittle star, 1 serpent sea star, and 1 cleaner wrasse