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README.md

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<img src="https://i.imgur.com/UrDb9qc.png" alt="Regular expression">
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</p>
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上面这个正则表达式可以匹配 `john_doe``jo-hn\_doe``john12\_as`。但是它不能匹配 `Jo`,因为该字符串里面包含了大写字符,并且它太短了。
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上面这个正则表达式可以匹配 `john_doe``jo-hn_doe``john12_as`。但是它不能匹配 `Jo`,因为该字符串里面包含了大写字符,并且它太短了。
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## 目录
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