The term "regional street food" can be replaced with a variety of synonyms, depending on the context. One such synonym could be "local cuisine," which emphasizes the connection between food and culture in a specific region. Alternatively, "street eats" or "street fare" could be used to describe the casual, often portable foods sold by vendors on city streets. "Ethnic cuisine" could be applicable when discussing the unique flavors and cooking techniques of a particular cultural group. Other options might include "traditional food," "authentic cuisine," or "neighborhood cuisine," depending on the intended tone and emphasis of the discussion about regional food.