Well you can usually tell a regurg by the smell. It is the worst smell ever. Poo may smell bad but a regurg smells WAY worse.
After 24 hours I wouldn't really expect a regurg. It should be mostly digested after 24 hours and fully digested (and moving through the tubes) after 48 hours.
If it smelled like death then it was probably a regurg. If so, don't feed your snake for 14 days and then offer food again. You need to give them a little bit of a recovery time as regurgitating is never good on their system.