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Merged
merged 3 commits into from
Sep 5, 2017
Merged

Correct some word error #53

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67cae48
Correct some word error
syncxplus Aug 16, 2017
baac9e9
Merge branch 'master' into master
Aug 22, 2017
a75cefc
Merge branch 'master' into master
Sep 5, 2017
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9 changes: 4 additions & 5 deletions README-cn.md
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|*|匹配>=0个重复的在*号之前的字符.|
|+|匹配>=1个重复的+号前的字符.
|?|标记?之前的字符为可选.|
|{n,m}|匹配num个中括号之前的字符 (n <= num <= m).|
|{n,m}|匹配num个大括号之前的字符 (n <= num <= m).|
|(xyz)|字符集, 匹配与 xyz 完全相等的字符串.|
|&#124;|或运算符,匹配符号前或后的字符.|
|&#92;|转义字符,用于匹配一些保留的字符 <code>[ ] ( ) { } . * + ? ^ $ \ &#124;</code>|
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### 2.3.2 `+` 号

`+`号匹配`+`号之前的字符出现 >=1 次个字符.
`+`号匹配`+`号之前的字符出现 >=1 次.
例如表达式`c.+t` 匹配以首字母`c`开头以`t`结尾,中间跟着任意个字符的字符串.

<pre>
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## 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}` 匹配最少 2 位最多 3 位 0~9 的数字.

<pre>
"[0-9]{2,3}" => The number was 9.<a href="#learn-regex"><strong>999</strong></a>7 but we rounded it off to <a href="#learn-regex"><strong>10</strong></a>.0.
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`?=...` 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: `(?=...)`.
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.
例如, 表达式 `(T|t)he(?=\sfat)` 匹配 `The` 和 `the`, 在括号中我们又定义了前置约束(存在) `(?=\sfat)` ,即 `The` 和 `the` 后面紧跟着 `(空格)fat`.
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