To regret one's errors to the point of not repeating them is true repentance.there

悔恨自己的错误，而且力求不再重蹈覆辙，这才是真正的悔恨。

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To sacrifice one's lifetime for it, and to never regret it.

牺牲一个人的一生的话，并没有感到后悔。

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Although remorse is usually thought to spring from regret for having done something wrong, it may be that its origin is the realization that one's own nature is irremediably flawed.

尽管懊悔通常被认为源自于一个人对做错事情的悔恨，但其原因可能是一个人意识到自身存在的无可救药的缺陷。

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Ms. Kelley's apparent regret points to one of the more unusual aspects of the case: what began as a seemingly minor case of cyberstalking mushroomed into fears that the Central Intelligence Agency director's personal email account had been hacked, which spawned concerns the CIA director might have passed sensitive information to his mistress.

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Playing her first tournament since damaging an ankle injury at the Australian Open, Li's one regret was her inability to serve better.

CNN: Murray cruises into Miami quarters

Another regret for Hassan is his failure to underline his skills by performing in one of Europe's major leagues.

BBC: Hossam Hassan in action for Egypt