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So what counts as a "regular" sub? That's any sub except for Subway's "premium" subs which basically consists of just the Big Philly Cheesesteak and the Pastrami sub (What counts as a "premium" sub might vary with location).
Other than those two subs, anything else is available for an even 5 bucks as long as you get the Footlong version.
Also new at Subway for a limited-time is the Raspberry Cheesecake cookie with bits of raspberry and cheesecake bake into the cookie.