I might well regret it later.

我以后也许会对此很后悔。

《柯林斯英汉双解大词典》

I don't want to make the wrong decision and regret it later.

我不想作出错误的决定，以后后悔。

《柯林斯英汉双解大词典》

Are you going to regret it later?

你一会儿会后悔吗？

youdao

Sometimes,people say something to a friend or family member that they later regret because it hurts that person's feelings.

VOA: special.2010.06.20

But still she contacted this person, spent time with him and later came to regret it.

但你的朋友还是联系了这个人，跟他相处了一段时间，慢慢有点后悔了。

I should have 课堂 - SpeakingMax英语口语达人

It may have been a decision that the museum later came to regret.

BBC: 7 questions on rejection letters

"Sadly we do not have the funding necessary to keep employees on, so it is with great regret that we place ourselves in a position where we will have to make redundant later today the vast majority of the workforce, " a representative of administrators PriceWaterhouseCoopers said.

BBC: 'Vast majority' of LDV jobs to go