I have never regret sending the old lady to hospital at the cost of missing the interview.

我从未后悔因为送那位老人家去医院而错过了面试。

I never regret what I had done.

我做过的事从不悔怨。

We'll never regret piercing our ears.

我们从不会后悔打了耳洞。

We 'll never regret piercing our ears.

我们从不会后悔打了耳洞。