I did regret not going to university, but I turned that around. I regret the missed opportunities in life, and the missed opportunities for my daughters.
But regrets are not progressive, so I try to take the veiwpoint that everything happens for a reason. In some ways I'm glad I had the experience I did because it made me a stronger person, capable of a level of compassion and empathy I might not have otherwise developed. As Paul Anka says so eloquently, "regrets, I've had a few, but then again too few to notice".