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]
(..) but you paid for it. Right. The holster too. That's tax-deductible. You can write that off. Yes, sir! Andy was a regular cottage industry. In fact, it got so busy at tax time, he was allowed a staff. Could you hand me a stack of s? Got me out of the wood shop a month out (..)1994 The Shawshank Redemption
(..) if that's your thing... ...bottle of brandy to celebrate your kid's high school graduation. Damn near anything within reason. Yes, sir! I'm a regular Sears and Roebuck. So when Andy Dufresne came to me in ... ...and asked me to smuggle Rita Hayworth into the prison for him... (..)1994 The Shawshank Redemption