I know that returning customer refers to someone who buys at or visit a shop for the second time, at least.
How about if I'd like to emphasize a customer who often buys at the shop? The point is that he often buys there. Returning customer just sounds like it is not the first time only.
Regular customer? Doesn't sound right to me.
kenny1999 Regular customer? That is fine. You could call him a patron, too.
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kenny1999Regular customer?
That is fine. You could call him a patron, too.
kenny1999returning customer
This is not familiar.
kenny1999Regular customer?
Only this is familiar in the UK.
kenny1999Regular customer?
Yes, that is common in American English.