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fix a misspell #80

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Aug 22, 2017
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fix a misspell #80

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2 changes: 1 addition & 1 deletion README-cn.md
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Expand Up @@ -354,7 +354,7 @@

`?=...` 前置约束(存在), 表示第一部分表达式必须跟在 `?=...`定义的表达式之后.

返回结果只瞒住第一部分表达式.
返回结果只满足第一部分表达式.
定义一个前置约束(存在)要使用 `()`. 在括号内部使用一个问号和等号: `(?=...)`.

前置约束的内容写在括号中的等号后面.
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