That definition may be problematic in respect to life-and-death decisions such as cryonics: Once I am dead, I am not around to regret any decision. So any choice that leads to my death could not be considered bad.

For instance, I will never regret not having signed up for cryonics. I may however regret doing it if I get awakened in the future and my quality of life is too low. On the other hand, I am thinking about it out of sheer curiosity for the future. Thus, signing up would simply help me increasing my current utility by having a hope of more future utility. I am just noticing, this makes the decision accessible to your definition of preference again, by posing the question to myself: "If I signed up for cryonics today, would I regret the [cost of the] decision tomorrow?"