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]).
Раскрыты подробности ночных атак ВСУ на Россию07:46
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暮色四合，黄山之巅，迎客松在晚霞中舒展着苍劲枝干。全国人大代表、安徽黄山迎客松第十九任“守松人”胡晓春目送游客下山后，开始填写值班日志。这样的守护，日复一日。
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