A regurge is an event that occurs soon after the snake is fed, and is commonly done in a "fight or flight" situation...the snake divests itself of it's meal in order to escape a predator. The meal is regurged in order to divert energy to quick motion and escape. It is a relatively non-taxing event, as it often does not include any digestion.
Vomiting is just that...the snake cannot digest the food for a variety of reasons: improper husbandry, extreme stress, internal parasites, disease or a dysfunction of the digestive system. It involves a degree of digestion and is fairly rough on the animal.
If this occurred 5 days after ingestion of the prey item then it was definitely vomiting. If nothing else is wrong with the animals, then I would wait a minimum of two weeks to offer it another prey item and dose it's water with Benebac.
If the snake is showing signs of illness, then it needs to see a qualified herp vet. The vomiting is then most likely a symptom of a larger issue.
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