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HomeBackend DevelopmentPHP Tutorial惯用的PHP正则表达式汇总

常用的PHP正则表达式汇总

PHP中的常用正则表达式集锦:

  匹配中文字符的正则表达式: [\u4e00-\u9fa5]

      评注:匹配中文还真是个头疼的事,有了这个表达式就好办了

      匹配双字节字符(包括汉字在内):[^\x00-\xff]

      评注:可以用来计算字符串的长度(一个双字节字符长度计2,ASCII字符计1)

      匹配空白行的正则表达式:\n\s*\r

      评注:可以用来删除空白行

      匹配HTML标记的正则表达式:]*>.*?\1>|<.>

      评注:网上流传的版本太糟糕,上面这个也仅仅能匹配部分,对于复杂的嵌套标记依旧无能为力

      匹配首尾空白字符的正则表达式:^\s*|\s*$

      评注:可以用来删除行首行尾的空白字符(包括空格、制表符、换页符等等),非常有用的表达式

      匹配Email地址的正则表达式:\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*

      评注:表单验证时很实用

      匹配网址URL的正则表达式:[a-zA-z]+://[^\s]*

      评注:网上流传的版本功能很有限,上面这个基本可以满足需求

      匹配帐号是否合法(字母开头,允许5-16字节,允许字母数字下划线):^[a-zA-Z][a-zA-Z0-9_]{4,15}$

      评注:表单验证时很实用

      匹配国内电话号码:\d{3}-\d{8}|\d{4}-\d{7}

      评注:匹配形式如 0511-4405222 或 021-87888822

      匹配腾讯QQ号:[1-9][0-9]{4,}

      评注:腾讯QQ号从10000开始

      匹配中国邮政编码:[1-9]\d{5}(?!\d)

      评注:中国邮政编码为6位数字

      匹配身份证:\d{15}|\d{18}

      评注:中国的身份证为15位或18位

      匹配ip地址:\d+\.\d+\.\d+\.\d+

      评注:提取ip地址时有用

      匹配特定数字:

      ^[1-9]\d*$    //匹配正整数

      ^-[1-9]\d*$   //匹配负整数

      ^-?[1-9]\d*$   //匹配整数

      ^[1-9]\d*|0$  //匹配非负整数(正整数 + 0)

      ^-[1-9]\d*|0$   //匹配非正整数(负整数 + 0)

      ^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$   //匹配正浮点数

      ^-([1-9]\d*\.\d*|0\.\d*[1-9]\d*)$  //匹配负浮点数

      ^-?([1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0)$  //匹配浮点数

      ^[1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0$   //匹配非负浮点数(正浮点数 + 0)

      ^(-([1-9]\d*\.\d*|0\.\d*[1-9]\d*))|0?\.0+|0$  //匹配非正浮点数(负浮点数 + 0)

      评注:处理大量数据时有用,具体应用时注意修正

      匹配特定字符串:

      ^[A-Za-z]+$  //匹配由26个英文字母组成的字符串

      ^[A-Z]+$  //匹配由26个英文字母的大写组成的字符串

      ^[a-z]+$  //匹配由26个英文字母的小写组成的字符串

      ^[A-Za-z0-9]+$  //匹配由数字和26个英文字母组成的字符串

      ^\w+$  //匹配由数字、26个英文字母或者下划线组成的字符串

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