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What are the classic poems expressing regret?

1, a moment that should last forever, has come and gone unconsciously. -"Jinse" Li Shangyin

It was unusual at that time that gambling books were so fragrant. -"Happy Yarn" Nalan Xingde

Chang 'e should regret stealing the elixir. -Chang 'an Li E Shang Yin

4. Young women in boudoir don't know what to worry about, and make up their brothels in spring. Suddenly I saw the green willows, and I felt uncomfortable; Oh, I regret that I shouldn't have asked my husband to find Hou Feng. -"in my heart forever" Wang Changling