Abendbrot is probably not regional, though Abendessen (evening meal) may be more standard use, especially when going out or having a small family meal is not implied.
Brotzeit is regional for a mid-day meal (10am-5pm?), with Imbiss and Vesper other alternatives. Those three can also be "taken with you" ("eine Brotzeit/einen Imbiss/eine Vesper mitnehmen") when leaving your house to be consumed during (e.g.) a day trip.
Brotzeit is regional for a mid-day meal (10am-5pm?), with Imbiss and Vesper other alternatives. Those three can also be "taken with you" ("eine Brotzeit/einen Imbiss/eine Vesper mitnehmen") when leaving your house to be consumed during (e.g.) a day trip.