Ancient poems about regret

A poem expressing regret:

Meng Xue knows which day it is. He looks to the north of the building. -"Send away the relocated guests" by "Living Toad"

Who says there is no shortage of life, and the running water can still flow west in front of the door? Don't sing yellow chickens with white hair. -Su Shi's "Huanxisha"

Chang 'e, I must regret eating the elixir, and now I am alone, in the blue sky, singing every night. -"Chang 'e" Li Shangyin

There is nothing to do, flowers bloom and fall, and it seems familiar that Yan returns. Wandering alone in the small garden, fragrant path. -Yan Shu's "Huanxisha"

It makes people feel sentimental and thin, and now I really regret it. -Nalan Xingde's "Breaking Huanxisha"