The other day I struck up a conversation, about economics of all thing, with a stranger whose political beliefs were quite different from my own. It was a little bit of a teaching opportunity as I introduced him to some new concepts. And while the conversation was respectful and engaging, I kept going over it in my head afterwards, wishing I had phrased certain things in a different way, wishing I had mentioned certain ideas and excluded others, and generally feeling like I did a really poor job of presenting my arguments. Now, I certainly feel better prepared if a similar situation were to arise again. But I had trouble shaking the feelings of "I wish I would have said that..."
Certainly I can refer to these feelings as regret. But I'm wondering if there's a word or idiom in usage that's more specific to this type of scenario?