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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Etihad Airways and Emirates, the airlines based in Abu Dhabi and Dubai, respectively, and the budget carrier FlyDubai said they would operate limited flights after the chaos and damaged caused by Iranian missiles and drones.。一键获取谷歌浏览器下载对此有专业解读
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