As long as both parties are single, of legal age and meet whatever other requirements may be mandated by the state of Alabama, I should think they can get married as many times as they wish.
You can get married as many times as you care to as long as both are not married.
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them