I don't regret anything.
And I think nobody should regret anything as well.
(((Regret: «a feeling of sadness about something sad or wrong or about a mistake that you have made, and a wish that it could have been different and better» Cambridge Dictionary)))
It doesn't even make sense if you think about it.
There is no way you can predict the future or the consequences of an action, the same way you cannot know what would've happened if you had done something differently in the past.
This is the main reason I don't regret anything.
Sometimes there is some instant «regret»/frustration, but, after all, I did what I thought was best at that moment; and what happened had to happen.
For me, the only understandable, but still insufficient, reason to regret something is if you've done something with bad intentions.
I believe the fact that I always try to do my best and what I think is best also helps me not regretting things.
