The Greek word for repent is μετανοώ
There are versions of the word repent and mention of the word repent in the Old Testament. The actual word, repent, was not mentioned until Matthew chapter 4. Repent was the first command the Jesus gave.
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According to the Merriam-Webster Dictionary, the word "repent" means to turn away from sin. The second definition of the word "repent" is to feel regret for a wrong action.
The word repent is a verb. The noun form is repenter.
Repent
She asked me to repent, the which I did
Sin
bereuen
The doctor spared no effort in trying to save the patient's life.
Repent
The word you are looking for is "regret."