"The man who insists upon seeing with perfect clearness before he decides, never decides. Accept life, and you must accept regret." Henri-Frédéric Amiel

Regret is an odd feeling. I find that it applies directly to a single moment, action or consequence.

The night before last I had sex with my friends boss. I regret none of this even though the sex was average and I don't wish to repeat the event.

I do regret that everyone in my company will now know. I regret the consequences. Not the action itself.