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]
(..) Shit. I have to run next door. Jane left her geometry book in my bag, and she needs it to do her homework. So you and psycho boy are fucking on, like, a regular basis now, right? No. Come on. You can tell me. Does he have a big dick? I'm not going to talk about his dick (..)1999 American Beauty
(..) - - Gross! - It wasn't gross. It was kind of cool. - So did you do it with him? He shoots for on, like, a regular basis. - It would've been majorly stupid of me to turn him down. - You are a total prostitute. Hey, that's how things really are. You just don't know because you're (..)1999 American Beauty