PA28 pilot reported electrical system malfunction inflight resulting in diversion.

Narrative

I was enroute to ZZZ from ZZZ1; filed on an IFR flight plan. Visual meteorological conditions prevailed over much of the flight path. I was in cruise at 7000 ft. and just nearing ZZZ2 from the SW on VXX when I noticed 0 amps on the charging system during one of my routine instrument scans. I spent a few seconds; likely much less than a minute; checking circuit breakers (none were tripped) and doing some troubleshooting to confirm my suspicion that the alternator had failed. I then notified Air Traffic Control and began to plan diversion options. The Controller suggested ZZZ3; and I agreed it was a logical choice. I began to receive vectors for a visual final. I began shedding electric load where appropriate; and I noted during the descent the voltage on the battery was now reading approximately 12.3 volts. I completed my pre-landing checklist and briefing the field during the descent. I also prepared my handheld radio in case of further equipment outages. The events took approximately 10 minutes from start to finish. An uneventful landing was made in ZZZ3. Aside from repairing the aircraft - It might have been possible to catch the fault by testing the charging system at more regular maintenance intervals. After the fact it was identified that the voltage regulator was actually at fault. Corrective action has been taken at this time.