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，这一点在PDF资料中也有详细论述
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]).，这一点在PDF资料中也有详细论述
英國起初不允許美軍使用英國基地攻擊伊朗，但後來開放基地用於對伊朗進行「防禦性」打擊。
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