to express regret

基本解释

And in case he wants to express regret, he will do it indirectly .
如果他真要表示悔意，他会间接地表示。
We had provoked and offended people needlessly, and so it seemed right to express regret.
我们激怒了人民，无意的冒犯了他们，因此只有表示忏悔才是明智的。
The latest fallout between the two came when Mr Josipovic went to the Bosnian parliament last month to express regret for Croatia’s role in the Bosnian war.
两位领导人间的不和源自上月总统Josipovic到波黑议会说的克罗地亚为在波黑战争中的所扮演的角色忏悔。

This is great when you want to express regret for something that you perhaps did not do.
当你想表达对一些过去没做成的事情感到后悔时，你可以使用这个句型。
I should have 课堂 - SpeakingMax英语口语达人
In the next example you can use "I'm sorry" not to express regret for your personal fault.
下一个例句中，“I'm sorry”的使用并不是用来表达对个人过失的抱歉。
I'm sorry 课堂 - SpeakingMax英语口语达人
Another situation where you can use "I wish" is when you express regret, a desire to stay longer, for example.
另一种使用“I wish”的情况是当你表达遗憾的时候，例如，希望多待一段时间。
I wish 课堂 - SpeakingMax英语口语达人

The latest fallout between the two came when Mr Josipovic went to the Bosnian parliament last month to express regret for Croatia's role in the Bosnian war.
ECONOMIST: The problems caused when two leaders fall out