Historically, most wars have demonstrated elements that are regular and irregular, symmetric and asymmetric.

CENTERFORSECURITYPOLICY: Center for Security Policy | The Measure of a Superpower: A Two Major Regional Contingency Military for the 21st Century | Page: 3

Lawrence, an academic without formal military training, displayed an astonishing grasp of both regular and irregular military tactics.

ECONOMIST: Lawrence of Arabia

"Japan accepts regular and irregular inspections from the IAEA and makes public how it handles and uses plutonium, which proves that Japan makes a peaceful use of it, " he said.

WSJ: U.S. Opposes Japan's Nuclear Plan

British troops, with the support of coalition air power, have been pushing steadily into Basra since shortly after the start of the war, facing fierce resistance from Iraqi regular and irregular troops.

CNN: British 'taking control' of Basra