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]
(..) a surf vacation to El Salvador and got a tattoo infection. He had to die with a partial mermaid on his shoulder. It just looked like a regular stupid lady. Where was his ceremony? Am I the only one that cares about doing something nice for Ben? Lucy, it's not that we don't care. (..)2010 TvShow: Scrubs Title: Our Thanks Season: 9 Episode 13