for example, the regex [a-zA-Z] only cares about two kinds of characters: letters and everything else. so instead of individually taking derivatives for 52 alphabet characters a..z, A..Z, we can conclude from the start that there are only two kinds of characters we care about: letters ([a-zA-Z]) and non-letters ([^a-zA-Z]).
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特别是我的堂表兄弟们故意询问母亲心情时，时不时问：“有没有人欺负咱？有的话，您可尽管告诉我。要知道您是有儿女的人，咱一定不能受那窝囊气。”“是呀，妈妈，咱们有儿有女的人，您放心有人给您出头、为您撑腰。”兄弟们与母亲对话的语调是大声的、充满底气的，那些门里门外的人都听得见。