book: fix the incorrect character in regex #91
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此处换用 |
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我们在该条目下标明一下正确写法怎么样？避免初学者感到迷惑 |
确实应该如此，欢迎提供相关 PR。 |
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resolved in #107 |
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说明
正则表达式中，选择应该是
|， 这里应该是个笔误。