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]
(..) Oh,penny,this is a natural human process,and we're talking about statistically significant savings. Now,if you assume tampons per cycle and a -day cycle... are you fairly regular? Okay,no warehouse store,but we're still on for putt-putt golf,right? Hey,I just ran into penny. (..)2007 TvShow: The Big Bang Theory Title: The Luminous Fish Effect Season: 1 Episode 4