I have no regret marrying you.

我不后悔嫁给你。

I take no regret marrying him.

我一点都不后悔和他结婚。

I have no regret knowing you!

认识你，我一生无憾！

I feel no regret at her absence.

她缺席，我并不遗憾。

There is already no regret.

已经没有遗憾了。