I don't do regrets. Regrets are pointless. It's too late for regrets. You've already done it, haven't you? You've lived your life. No point wishing you could change it.
At the end of the day let there be no regrets, only a desire to do more tomorrow than you did today.
Positive lessons learned... Blessings recognized... Humor found... No regrets.
Never job backwards. What might have been was a waste of time.