网友的理解正确。

表示现在对过去发生之事，“后悔没做某事、不后悔做了某事”，regret 后可以接3种非谓语形式。分别举例如下：

1.  我后悔念书时没有努力。

I regret not working harder at school.  

I regret not having worked harder at school.  

I regret not to have worked harder at school.  

2. 我不后悔和她分手。

I don't regret breaking up with her.

I don't regret having broken up with her.

I don't regret to have broken up with her.