What are the poems about regret?

Verses expressing regret:

Meng Xue knows what day it will be, leaning on the building and looking to the north to chant. ──"Send Off the Migrant Guests" Author: Qi Chan

Who knows that there will be no less in life, the water in front of the door can still flow to the west, and there will be no more white hair singing yellow chicken. ──Author of "Huanxi Sand": Su Shi

Chang'e should regret stealing the elixir, and her heart will be filled with blue sea and blue sky every night. ──Author of "Chang'e": Li Shangyin

There is no choice but the flowers fall away, and the swallows return as if they have known each other before. The fragrant path in the small garden wanders alone. ──Author of "Huanxisha": Yan Shu

When people become sentimental, their sentiments become less so, and now I really regret my sentiments.

──"Breaking Through the Huanxi Sands" Author: Nalan Xingde