I like to think there's very few true regrets because most things are regretted because they haven't been dealt with and the lessons therein not yet extracted.
Like most, I've had my share of regrets, but once you've taken the time to understand them, learn from them, realise the importance they had in your growth in hindsight, even if they were painful detours or obstacles... then they cease to be regrets. It's hard to call them that after that.