2 sentences

1. 我从未后悔过那次投资。

   wǒ cóng​wèi hòu​huǐ guo nà cì tóu​zī.

   I have never regretted that investment.

   Source: CCMatrix

2. 不要后悔过去。

   bù​yào hòu​huǐ guò​qù.

   Do not regret the past.

   Source: CCMatrix