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fix an explanatory error

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In the explanation ‘例如, 表达式 `/at(.)?$/gm` 表示在待检测字符串每行的末尾搜索 `at`后跟一个或多个 `.` 的字符串, 并返回全部结果.‘

‘一个或多个’ should be  ‘0个或1个’.
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Lee Sure 2017-11-13 11:40:14 +08:00 committed by GitHub
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README-cn.md
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@ -453,7 +453,7 @@
像之前介绍的 `(^,$)` 用于检查格式是否是在待检测字符串的开头或结尾. 但我们如果想要它在每行的开头和结尾生效, 我们需要用到多行修饰符 `m`.
例如, 表达式 `/at(.)?$/gm` 表示在待检测字符串每行的末尾搜索 `at`后跟一个或多个 `.` 的字符串, 并返回全部结果.
例如, 表达式 `/at(.)?$/gm` 表示在待检测字符串每行的末尾搜索 `at`后跟0个或1个 `.` 的字符串, 并返回全部结果.
<pre>
"/.at(.)?$/" => The fat