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fix change the font .
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README.md

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- [不区分大小写](#51-不区分大小写)
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- [全局搜索](#52-全局搜索)
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- [多行匹配](#53-多行匹配)
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- [福利](#福利)
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- [常用正则表达式](#常用正则表达式)
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## 1. 基本匹配
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on the <a href="#learn-regex"><strong>mat.</strong></a>
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</pre>
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## 福利
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* *正整数*: `^\d+$`
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* *负整数*: `^-\d+$`
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* *电话号码*: `^+?[\d\s]{3,}$`
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* *电话代码*: `^+?[\d\s]+(?[\d\s]{10,}$`
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* *整数*: `^-?\d+$`
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* *用户名*: `^[\w\d_.]{4,16}$`
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* *字母数字字符*: `^[a-zA-Z0-9]*$`
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* *带空格的字母数字字符*: `^[a-zA-Z0-9 ]*$`
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* *密码*: `^(?=^.{6,}$)((?=.*[A-Za-z0-9])(?=.*[A-Z])(?=.*[a-z]))^.*$`
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* *电子邮件*: `^([a-zA-Z0-9._%-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4})*$`
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* *IPv4 地址*: `^((?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))*$`
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* *小写字母*: `^([a-z])*$`
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* *大写字母*: `^([A-Z])*$`
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* *网址*: `^(((http|https|ftp):\/\/)?([[a-zA-Z0-9]\-\.])+(\.)([[a-zA-Z0-9]]){2,4}([[a-zA-Z0-9]\/+=%&_\.~?\-]*))*$`
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* *VISA 信用卡号码*: `^(4[0-9]{12}(?:[0-9]{3})?)*$`
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* *日期 (MM/DD/YYYY)*: `^(0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])[- /.](19|20)?[0-9]{2}$`
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* *日期 (YYYY/MM/DD)*: `^(19|20)?[0-9]{2}[- /.](0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])$`
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* *万事达信用卡号码*: `^(5[1-5][0-9]{14})*$`
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## 常用正则表达式
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* **正整数**: `^\d+$`
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* **负整数**: `^-\d+$`
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* **电话号码**: `^+?[\d\s]{3,}$`
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* **电话代码**: `^+?[\d\s]+(?[\d\s]{10,}$`
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* **整数**: `^-?\d+$`
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* **用户名**: `^[\w\d_.]{4,16}$`
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* **字母数字字符**: `^[a-zA-Z0-9]*$`
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* **带空格的字母数字字符**: `^[a-zA-Z0-9 ]*$`
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* **密码**: `^(?=^.{6,}$)((?=.*[A-Za-z0-9])(?=.*[A-Z])(?=.*[a-z]))^.*$`
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* **电子邮件**: `^([a-zA-Z0-9._%-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,4})*$`
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* **IPv4 地址**: `^((?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))*$`
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* **小写字母**: `^([a-z])*$`
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* **大写字母**: `^([A-Z])*$`
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* **网址**: `^(((http|https|ftp):\/\/)?([[a-zA-Z0-9]\-\.])+(\.)([[a-zA-Z0-9]]){2,4}([[a-zA-Z0-9]\/+=%&_\.~?\-]*))*$`
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* **VISA 信用卡号码**: `^(4[0-9]{12}(?:[0-9]{3})?)*$`
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* **日期 (MM/DD/YYYY)**: `^(0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])[- /.](19|20)?[0-9]{2}$`
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* **日期 (YYYY/MM/DD)**: `^(19|20)?[0-9]{2}[- /.](0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])$`
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* **万事达信用卡号码**: `^(5[1-5][0-9]{14})*$`
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## Contribution
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