Well, you either have a really bad telephone connection, or you need to get your hearing checked.
They probably said Regulator/Rectifier, as in Voltage Regulator/Rectifier.
The rectifier part takes the AC from the charging system and turns it into DC. The regulator controls the output of the charging system.
They used to be two seperate units, but for about 20 years now, they've all been in the same box, and the name was shortened to Regulator/Rectifier.
Anyway, if it's bad, the bike won't charge. And it's the most common failure point for the charging system. So it sounds like they've solved the problem.
Fred