I regret doing that.

我后悔做了那件事。

youdao

I'm happy with my life and now I have a part-time job with a local association that I enjoy, but sometimes I regret not doing more career-wise.

我对自己的生活很满意，现在我在一家地方机构兼职，也很喜欢这份工作，但有时我很后悔没有更好地规划自己的事业。

youdao

I know that when we find our weakness, we may say that I will never do that again, and regret doing so meaningless thing.

我知道，当我们发现我们自己的弱势的时候，我们可能会对自己说，我再也不会那样做了，我好后悔啊。

youdao