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Could i use a regulator for a air compressor or does it have to be for co2?
Yes you can, but the air is going to make your beer go sour if you don't drink it all within 48 hrs. CO2 and N2 will keep this from happening.
No NO NO...Air compressor regulators are good for 120psi, maybe an expensive one 250, CO2 is around 800 PSI - If you connected one of those to a CO2 tank you have a bomb on your hands.
Now you can force the beer out of the keg with compressed air if you have 10-15 buddies over and know you will kill in the keg in a the night, but then you still need the compressor. And without all other equipment its still flat beer.
Keep an eye on on ebay or craigslist for a decent regulator I know its a little more cash, but its not worth getting hurt!