Or you will regret it one day.

否则总有一天你会后悔的。

youdao

Come on! Go ahead, or you will regret it for the rest of your life.

加油！勇往直前吧，否则你会后悔一辈子的。

youdao

We've all made mistakes as a result of living unconsciously, and while it is worthy to examine them from a place of learning, there is no value dwelling in them in a state of guilt or regret.

因为无意识地生活，我们都犯过错，重要的是从中检讨，悟到一些道理，一味地自责或后悔是没有价值的。

youdao

Sometimes,people say something to a friend or family member that they later regret because it hurts that person's feelings.

VOA: special.2010.06.20

It's great for expressing regret, both for yourself or for a friend,

你可以为你自己或是你的朋友表达后悔之意。

I should have 课堂 - SpeakingMax英语口语达人

And he watched as she was passed over for promotions simply because she was a woman, but he saw how she kept on getting up, doing what she had to do, that same job year after year, and doing it without complaint or regret.

WHITEHOUSE: The White House

So is there any regret or concern about that, that it seems like this violence continues despite the apology?

WHITEHOUSE: Press Briefing

Does she regret that quality of hers, or is she, on the contrary, proud of it?

NEWYORKER: Seeing and Believing