The buses run from 4 a.m. to midnight 'at regular intervals'. [=there is the same amount of time between buses]
It's nothing special, just a 'regular' [='basic'] stereo. = It's just a 'regular old' stereo.
He is one of the store's 'regular customers'. [=customers who shop at the store frequently]
(..) with the Secretary of Defense. But I also can't be Sergeant Cooper, because that might lead you to think of me as just a regular Joe. This might take some thought. As you were. What the hell is wrong with you? Yeah, how could you do that? (..)2011 TvShow: The Big Bang Theory Title: The Skank Reflex Analysis Season: 5 Episode 1