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]
(..) What about the kids. Did you tell your board that the kids want to hear the truth? I see. Maybe if you just played some regular kiddy songs? What do you want me to be? Like some... ...stupid, big, like, purple dinosaur? You don't have to be Barney. (..)1996 TvShow: Friends Title: The One After the Superbowl: Part 1 Season: 2 Episode 12