She looked back on the past without regret.

她回首往事毫无遗憾。

《牛津词典》

I struggle, I without regret.

我奋斗了，我无悔了。

youdao

Without regret to face yourself, face the future, never have regret!

可以无悔地面对自己，面对未来，不曾有过遗憾！

youdao

Present me with such a plan, and I will praise it with pleasure and accept it without the slightest feeling of regret."

VOA: special.2009.03.19

They had separated from their family without regret when they were, they thought, thirteen and fourteen.

NEWYORKER: The Woman of the House

They serve like their service members with pride, and they do it without complaint and they do it without regret.

WHITEHOUSE: First Lady Michelle Obama and Dr. Jill Biden Address National Governors Association | The White House

But he saw how she kept getting up, kept doing that same job year after year, without complaint, without regret.

WHITEHOUSE: Remarks by the First Lady at a Campaign Event