I don't understand why you suspect the regulator if you can't hear the motor. It is the opposite, if you could hear the motor but window doesn't work, then I'd suspect the regulator is bad and motor good (but they are replaced as single unit in many models). You need to take off door panel and determine if motor is getting power. If not, it could be a wire broken inside the rubber accordian like conduit to the door.

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2005 Mercedes C230k sport sedan, 6 speed
1987 Porsche 924S - 968-engined track car