I've heard this phrase used so many times now that I thought it was worth commenting on. The phrase always goes something like this:
"I don't regret anything, but if I could go back in time and do it again I would do it differently."
Isn't the second part of that sentence actually the very definition of "regret"? When people say this I wonder if there are any thoughts in their head which they are expressing. It's not just the case of reporting a false belief, but of reporting nothing. There is just no content of that sentence at all, at least not in any possible world.
