regret

She left her corporate job after ten years without any regrets.

(Chinese) 工作十年后，她毫无遗憾地辞去了那份公司职务。

My only regret is that I didn't spend more time traveling while I was young.

(Chinese) 我唯一的遗憾是年轻时没有花更多的时间去旅行。

I really regret forgetting to buy a birthday gift for my best friend.

(Chinese) 我真的很后悔忘了给最好的朋友买生日礼物。

The company management regretted the unexpected delay in product delivery.

(Chinese) 公司管理层对产品交付的意外延迟表示遗憾。