常用正则表达式
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正则表达式用于字符串处理、表单验证等场合,实用高效。现将一些常用的表达式收集于此,以备不时之需。
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匹配中文字符的正则表达式: [\u4e00-\u9fa5]
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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
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匹配双字节字符(包括汉字在内):[^\x00-\xff]
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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)
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匹配空白行的正则表达式:\n\s*\r
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评注:可以用来删除空白行
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匹配HTML标记的正则表达式:<(\S*?)[^>]*>.*?</\1>|<.*? />
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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
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匹配首尾空白字符的正则表达式:^\s*|\s*$
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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
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匹配Email地址的正则表达式:\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*
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评注:表单验证时很实用
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匹配网址URL的正则表达式:[a-zA-z]+://[^\s]*
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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
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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}$
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评注:表单验证时很实用
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匹配国内电话号码:\d{3}-\d{8}|\d{4}-\d{7}
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评注:匹配形式如 0511-4405222 或 021-87888822
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匹配腾讯QQ号:[1-9][0-9]{4,}
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评注:腾讯QQ号从10000开始
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匹配中国邮政编码:[1-9]\d{5}(?!\d)
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评注:中国邮政编码为6位数字
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匹配身份证:\d{15}|\d{18}
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评注:中国的身份证为15位或18位
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匹配ip地址:\d+\.\d+\.\d+\.\d+
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评注:提取ip地址时有用
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匹配特定数字:
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^[1-9]\d*$ //匹配正整数
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^-[1-9]\d*$ //匹配负整数
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^-?[1-9]\d*$ //匹配整数
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^[1-9]\d*|0$ //匹配非负整数(正整数 + 0)
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^-[1-9]\d*|0$ //匹配非正整数(负整数 + 0)
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^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$ //匹配正浮点数
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^-([1-9]\d*\.\d*|0\.\d*[1-9]\d*)$ //匹配负浮点数
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^-?([1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0)$ //匹配浮点数
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^[1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0+|0$ //匹配非负浮点数(正浮点数 + 0)
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^(-([1-9]\d*\.\d*|0\.\d*[1-9]\d*))|0?\.0+|0$ //匹配非正浮点数(负浮点数 + 0)
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评注:处理大量数据时有用,具体应用时注意修正
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匹配特定字符串:
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^[A-Za-z]+$ //匹配由26个英文字母组成的字符串
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^[A-Z]+$ //匹配由26个英文字母的大写组成的字符串
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^[a-z]+$ //匹配由26个英文字母的小写组成的字符串
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^[A-Za-z0-9]+$ //匹配由数字和26个英文字母组成的字符串
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^\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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评注:最基本也是最常用的一些表达式
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原载地址:http://lifesinger.3322.org/myblog/?p=185
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本文来源于月光博客 http://www.williamlong.info , 原文地址:http://www.williamlong.info/archives/433.html
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