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]
(..) the drugs they had me on. I've been hallucinating. - Oh. Thanks. Uh, 'scuse me. I think this might be Gatorade or somethin'. - I was just looking for some regular water. - Water? - Yeah. - You mean like in the toilet? What for? You know, just to drink. - Uh, this goes in your mouth. (..)2006 Idiocracy