What's your perspective on regrets? Do you have any in your life?

Waste of an emotion but we can't help it sometimes. Yes, I have a big one but I tend to remind myself where I was emotionally at that time and it usually fully explains my decisions. It's easy to look back and see where I made a mistake but who could have known then? Plus we tend to look at things from the perspective of the older version of us and forgot what we felt like about the life when we were younger.