better to be safe than sorry (proverb) / to be prepared just in case
悔之已晚
huǐ zhī yǐ wǎn
too late to be sorry
歹势
dǎi shì
(Tw) excuse me / to be sorry (from Taiwanese, Tai-lo pr. [pháinn-sè])
自艾自怜
zì ài zì lián
to feel sorry for oneself
打扰了
dǎ rǎo le
sorry to interrupt you, but ... / sorry to have bothered you / sorry, I have to go / (slang) (coined c. 2017) used facetiously to terminate a conversation (esp. online) when the other person is being insufferable
叨扰
tāo rǎo
to bother / to trouble / (polite expression of appreciation for time taken to hear, help or host the speaker) sorry to have bothered you / thank you for your time