First there is a difference between regurgitation and spitting a rat right back out because it is to big.
So what should you do depends on what happened.
If you are dealing with a regurgitation, which means the prey was already getting digested and regurgitated 12/24/36 hours later, you need to do a complete clean up and wait 2 week before attempting to feed again/
If the rat was just spitted back out immediately there is nothing to do, feed on schedule next week, at his size your BP especially if it is a male does not need a rat bigger than 50/65 grams.
Bottom line you need to learn to properly feed your animal, because they can take large prey (obviously not in this case) does not mean they need a large prey.
Even my males that are over 1000 grams do not get anything larger than 85 grams rats, keep this in mind for the future, they are overfed in captivity and fatty liver issue is a reality, this is not a race feed appropriately.