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教科书式的正则匹配
source link: https://juejin.im/post/5b0cf331f265da0905017b48
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前言 正则在js中是一类比较特殊的对象，它可以匹配各个场景需要的格式验证，例如邮箱、手机号、用户登录名、密码等等，似乎无处不在，在常见的字符串检索或替换中，我们需要提供一种模式表示检索或替换的规则，来匹配一系列符合某个句法规则的字符串。 以下是正则的较为官
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