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fix format

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replace `~` with `～` to avoid incorrect format
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Alex Sun 2017-08-16 17:52:10 +08:00 committed by GitHub
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README-cn.md
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@ -206,7 +206,7 @@
## 2.4 `{}` 号
在正则表达式中 `{}` 是一个量词, 常用来一个或一组字符可以重复出现的次数.
例如, 表达式 `[0-9]{2,3}` 匹配 2~3 位 0~9 的数字.
例如, 表达式 `[0-9]{2,3}` 匹配 2～3 位 0～9 的数字.
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