Regret is a negative conscious and emotionalreaction to a person's decision making (which is a choice resulting in action or inaction) have you ever felt regret?
Yes I have definitely felt regret at times in my life. Do you know more about regret?
Regret
Regret is a negative conscious and emotional reaction to an undesirable situation. 
Regret is related to perceived opportunity. Its intensity varies over time after the decision, in regard to action versus inaction, and in regard to self-control at a particular age. The self-recrimination which comes with regret is thought to spur corrective action and adaptation. 
In Western societies adults have the highest regrets regarding choices of their education. 
Definition.
Regret has been defined by psychologists in the late 1990s as a "
Regret (decision theory)
In decision theory, on making decisions under uncertainty—should information about the best course of action arrive "after" taking a fixed decision—the human emotional response of regret is often experienced. The theory of regret aversion or anticipated regret proposes that when facing a decision, individuals might "anticipate" regret and thus incorporate in their choice their desire to eliminate or reduce this possibility. Regret is a negative emotion with a powerful social and reputational component, and is central to how humans learn from