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。

youdao

Used to express regret or disapproval.

有些人第一次表露出悔恨。

youdao

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。

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

When you express regret for something that you should have, should not have done.

当你想表达某种悔意，对某事你本该做，或本不该做，

I should have 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

Ferguson did, however, express regret at going public with his views and apologised to Wiley and the Football Association for doing so.

BBC: Ferguson apologises to ref Wiley

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

Collins, who would later express regret over his "friendly" testifying, went on to work on such 1950s classics as Riot in Cell Block 11 and Invasion of the Body Snatchers before finding regular employment in television.

BBC: Richard Collins: Blacklisted Hollywood writer dies