Regret typically is replaced for the word "sorry", but as it also means to "mourn" or "miss" perhaps it's more that vampires are symbolic of the regret of loss of life. The mourning of life that forces the demon to feed on the living in order to survive, the mourning of life that does not exist within the vampire itself.
You may be right. I'm not a native speaker so the nuances are often lost on me.
no subject
You may be right. I'm not a native speaker so the nuances are often lost on me.