This sentence pattern 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。

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Used to express regret or disapproval.

有些人第一次表露出悔恨。

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There was no need for the writer to express regret, he though.

便条的作者不必表示遗憾了，上校这样想着。 纠正这个错误其实很容易。

youdao

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

He phoned George Bush to express regret for the deaths of the Americans, the wife and daughter of a diplomat, and to tell him that senior police officers in charge of security in Islamabad had been moved.

ECONOMIST: The new symbols of anti-Americanism

Germany's Foreign Minister, Joschka Fischer, telephoned Mr Ruggiero to express his regret at his departure.

BBC: Berlusconi says Italy backs EU