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 what Sansa gives her when they meet in the courtyard, it's understandable that she would be upset. We've been with these characters on a pretty regular basis all the time for the past however many years. The fact they're coming back together again for the first time (..)2019 TvShow: Game of Thrones Title: Winterfell Season: 8 Episode 1