Suggested by Random Alucard has high speed regeneration so I’m sure that he is banking on this helping him out in the long run. I wouldn’t count on it if I was him since regeneration can only buy you so much time. Jiren would just hit Alucard hard enough to quickly cause his energy to run out and that would be the end of the fight. Considering that Alucard has no real way of fighting back, I’d say that it is all over for him. Jiren wins.