No regrets.

Never regret.

No regrets, only lessons.

Regret nothing, achieve everything.

Live without regrets.

Embrace mistakes, no regrets.

I will never regret you, or say I wish I'd never met you, because once upon a time, you were exactly what I needed.

这些句子都传达了一种坚定和果断的态度，适合在需要表达“不后悔”情感的场合使用。