I don’t know that I’ve ever regretted taking a risk. I’ve taken some bruises for them on occasion but not felt regret.
I did once try to block a staff strike with an ill-positioned / ill-timed wooden sword. I got a mild concussion that time, but still — I don’t think — regret (but I’m a bit fuzzy on the details, maybe it damaged the part of my brain that is capable of regret.)
I’m with Miyamoto Musashi, who wrote: “我事におゐて後悔を/せず” [“I will not regret my deeds.”] in his Dokkôdô [“Way of Walking Alone.”] Of course, he probably suffered his share of concussions as well.

😊😃
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It looks like brain damage produce good philosophers, speaking through experience. 🙂
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