So for a 1997 Integra, the alternator should crank out 13.5V at 90 Amps.

The regulator is an internal component within the alternator -- but it looks like it can be replaced independently of the alternator.

To test the regulator:

Bring the motor up to 3000 rpm with no load [in idle or P] until the radiator fan comes on. At that point, let the motor return to idle.

Check the voltage at the battery. If voltage exceeds 15.1V at 2000rpm - with all other electrical systems turned OFF - then the regulator needs replacing. Doing so involves dismantling the alternator, so it may be cheaper in terms of time and effort to replace the alternator/ regulator assembly atogether.

Oh, I had forgotten to ask...how old is the car? Mileage?