'Regret' in the Bible

For John came to you in the way of righteousness, and you had no faith in him, but the tax-farmers and the loose women had faith in him: and you, when you saw it, did not even have regret for your sins, so as to have faith in him.

Then Judas, who was false to him, seeing that he was to be put to death, in his regret took back the thirty bits of silver to the chief priests and those in authority,