I think we should learn from our mistakes, but perhaps not regret them.
It is hard not to regret when the mistakes have cost you more than the lessons learned can ever bring.
I have often longed to be the ignorant, narrow-minded, short-sighted woman I once was because I would still be loved. Not perfectly, no. But loved for real. And sometimes there is more to be said for that than for the "knowledge" this road has gotten me.