运维必备，正则表达式超全速查手册，赶快收藏！

^[0-9]*$n位的数字：^d{n}$至少n位的数字：^d{n,}$m-n位的数字：^d{m,n}$零和非零开头的数字：^(0|[1-9][0-9]*)$非零开头的最多带两位小数的数字：^([1-9][0-9]*)+(.[0-9]{1,2})?$带1-2位小数的正数或负数：^(-)?d+(.d{1,2})?$正数、负数、和小数：^(-|+)?d+(.d+)?$有两位小数的正实数：^[0-9]+(.[0-9]{2})?$有1~3位小数的正实数：^[0-9]+(.[0-9]{1,3})?$非零的正整数：^[1-9]d*$ 或 ^([1-9][0-9]*){1,3}$ 或 ^+?[1-9][0-9]*$非零的负整数：^-[1-9][]0-9"*$ 或 ^-[1-9]d*$

非负整数：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^d+$</span> 或 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[1-9]d*|0$</span>

非正整数：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^-[1-9]d*|0$</span> 或 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^((-d+)|(0+))$</span>

非负浮点数：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^d+(.d+)?$</span> 或 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[1-9]d*.d*|0.d*[1-9]d*|0?.0+|0$</span>

非正浮点数：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^((-d+(.d+)?)|(0+(.0+)?))$</span> 或 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^(-([1-9]d*.d*|0.d*[1-9]d*))|0?.0+|0$</span>

正浮点数：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[1-9]d*.d*|0.d*[1-9]d*$</span> 或 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^(([0-9]+.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*.[0-9]+)|([0-9]*[1-9][0-9]*))$</span>

负浮点数：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^-([1-9]d*.d*|0.d*[1-9]d*)$</span> 或 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^(-(([0-9]+.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*.[0-9]+)|([0-9]*[1-9][0-9]*)))$</span>

浮点数：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^(-?d+)(.d+)?$</span> 或 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^-?([1-9]d*.d*|0.d*[1-9]d*|0?.0+|0)$</span>

二、校验字符的表达式

汉字：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[u4e00-u9fa5]{0,}$</span>

英文和数字：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[A-Za-z0-9]+$</span> 或 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[A-Za-z0-9]{4,40}$</span>

长度为3-20的所有字符：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^.{3,20}$</span>

由26个英文字母组成的字符串：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[A-Za-z]+$</span>

由26个大写英文字母组成的字符串：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[A-Z]+$</span>

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由26个小写英文字母组成的字符串：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[a-z]+$</span>

由数字和26个英文字母组成的字符串：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[A-Za-z0-9]+$</span>

由数字、26个英文字母或者下划线组成的字符串：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^w+$ 或 ^w{3,20}</span>

中文、英文、数字包括下划线：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[u4E00-u9FA5A-Za-z0-9_]+$</span>

中文、英文、数字但不包括下划线等符号：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[u4E00-u9FA5A-Za-z0-9]+$</span> 或 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[u4E00-u9FA5A-Za-z0-9]{2,20}$</span>

可以输入含有<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^%&amp;',;=?$"</span> 等字符：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">[^%&amp;',;=?$"]+</span>

禁止输入含有~的字符 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">[^~"]+</span>

其它

.*匹配除 
 以外的任何字符。/[u4E00-u9FA5]/ 汉字/[uFF00-uFFFF]/ 全角符号/[u0000-u00FF]/ 半角符号

三、特殊需求表达式

Email 地址：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^w+([-+.]w+)*@w+([-.]w+)*.w+([-.]w+)*$</span>

[a-zA-Z0-9][-a-zA-Z0-9]{0,62}(/.[a-zA-Z0-9][-a-zA-Z0-9]{0,62})+/.?

[a-zA-z]+://[^s]* 或 ^http://([w-]+.)+[w-]+(/[w-./?%&=]*)?$

^(13[0-9]|14[5|7]|15[0|1|2|3|5|6|7|8|9]|18[0|1|2|3|5|6|7|8|9])d{8}$

电话号码(“XXX-XXXXXXX”、”XXXX-XXXXXXXX”、”XXX-XXXXXXX”、”XXX-XXXXXXXX”、”XXXXXXX”和”XXXXXXXX)：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^((d{3,4}-)|d{3.4}-)?d{7,8}$</span>

国内电话号码(0511-4405222、021-87888822)：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">d{3}-d{8}|d{4}-d{7}</span>

身份证号(15位、18位数字)：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^d{15}|d{18}$</span>

短身份证号码(数字、字母x结尾)：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^([0-9]){7,18}(x|X)?</span>$ 或 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^d{8,18}|[0-9x]{8,18}|[0-9X]{8,18}?$</span>

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)：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[a-zA-Z][a-zA-Z0-9_]{4,15}$</span>

密码(以字母开头，长度在6~18之间，只能包含字母、数字和下划线)：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[a-zA-Z]w{5,17}$</span>

强密码(必须包含大小写字母和数字的组合，不能使用特殊字符，长度在8-10之间)：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^(?=.*d)(?=.*[a-z])(?=.*[A-Z]).{8,10}$</span>

日期格式：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^d{4}-d{1,2}-d{1,2}</span>

一年的12个月(01～09和1～12)：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^(0?[1-9]|1[0-2])$</span>

一个月的31天(01～09和1～31)：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^((0?[1-9])|((1|2)[0-9])|30|31)$</span>

钱的输入格式

有四种钱的表示形式我们可以接受:”10000.00” 和 “10,000.00”, 和没有 “分” 的 “10000” 和 “10,000”：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[1-9][0-9]*$</span>

这表示任意一个不以0开头的数字,但是,这也意味着一个字符”0”不通过,所以我们采用下面的形式：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^(0|[1-9][0-9]*)$</span>

一个0或者一个不以0开头的数字.我们还可以允许开头有一个负号：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^(0|-?[1-9][0-9]*)$</span>

4.这表示一个0或者一个可能为负的开头不为0的数字.让用户以0开头好了.把负号的也去掉,因为钱总不能是负的吧.下面我们要加的是说明可能的小数部分：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[0-9]+(.[0-9]+)?$</span>

必须说明的是,小数点后面至少应该有1位数，所以”10.”是不通过的,但是 “10” 和 “10.2” 是通过的：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[0-9]+(.[0-9]{2})?$</span>

这样我们规定小数点后面必须有两位，如果你认为太苛刻了，可以这样：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[0-9]+(.[0-9]{1,2})?$</span>

这样就允许用户只写一位小数.下面我们该考虑数字中的 <span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">逗号</span> 了，我们可以这样：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^[0-9]{1,3}(,[0-9]{3})*(.[0-9]{1,2})?$</span>

1到3个数字,后面跟着任意个 逗号+3个数字，逗号成为可选，而不是必须：<span mp-original-font-size="16" mp-original-line-height="25" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 25px;">^([0-9]+|[0-9]{1,3}(,[0-9]{3})*)(.[0-9]{1,2})?$</span>

备注：这就是最终结果了,别忘了+可以用*替代如果你觉得空字符串也可以接受的话(奇怪,为什么?)最后,别忘了在用函数时去掉去掉那个反

xml文件：^([a-zA-Z]+-?)+[a-zA-Z0-9]+.[x|X][m|M][l|L]$

中文字符的正则表达式：[u4e00-u9fa5]

双字节字符：^-�)

空白行的正则表达式： s* (可以用来删除空白行)

HTML标记的正则表达式：<(S?)[^>]>.?</
>|<.? /> (网上流传的版本太糟糕，上面这个也仅仅能部分，对于复杂的嵌套标记依旧无能为力)

首尾空白字符的正则表达式：^s|s

) (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)

腾讯QQ号：[1-9][0-9]{4,}(腾讯QQ号从10000开始)

中国邮政编码：[1-9]d{5}(?!d)(中国邮政编码为6位数字)

IP地址：d+.d+.d+.d+(提取IP地址时有用)

IP地址：((?:(?:25[0-5]|2[0-4]d|[01]?d?d).){3}(?:25[0-5]|2[0-4]d|[01]?d?d))

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IP-v4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]?) (提取IP地址时有用)

校验IP-v6地址:

(([0-9a-fA-F]{1,4}:){7,7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]{1,}|::(ffff(:0{1,4}){0,1}:){0,1}((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9])\.){3,3}(25[0-5]|(2[0-4]|1{0,1}[0-9]){0,1}[0-9]))

子网掩码：

((?:(?:25[0-5]|2[0-4]\d|[01]?\d?\d)\.){3}(?:25[0-5]|2[0-4]\d|[01]?\d?\d))

校验日期:

^(?:(?!0000)[0-9]{4}-(?:(?:0[1-9]|1[0-2])-(?:0[1-9]|1[0-9]|2[0-8])|(?:0[13-9]|1[0-2])-(?:29|30)|(?:0[13578]|1[02])-31)|(?:[0-9]{2}(?:0[48]|[2468][048]|[13579][26])|(?:0[48]|[2468][048]|[13579][26])00)-02-29)$(“yyyy-mm-dd“ 格式的日期校验，已考虑平闰年。)

抽取注释：<span mp-original-font-size="16" mp-original-line-height="28" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 28px;"><!--(.*?)--></span>

查找CSS属性:<span mp-original-font-size="16" mp-original-line-height="28" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 28px;">^\s*[a-zA-Z\-]+\s*[:]{1}\s[a-zA-Z0-9\s.#]+[;]{1}</span>

提取页面超链接:<span mp-original-font-size="16" mp-original-line-height="28" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 28px;">(<a\s*(?!.*\brel=)[^>]*)(href="https?:\/\/)((?!(?:(?:www\.)?'.implode('|(?:www\.)?', $follow_list).'))[^" rel="external nofollow" ]+)"((?!.*\brel=)[^>]*)(?:[^>]*)></span>

提取网页图片:<span mp-original-font-size="16" mp-original-line-height="28" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 28px;">\< *[img][^\\>]*[src] *= *[\"\']{0,1}([^\"\'\ >]*)</span>

另外，搜索公众号GitHub猿后台回复“赚钱”，获取一份惊喜礼包。

提取网页颜色代码:<span mp-original-font-size="16" mp-original-line-height="28" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 28px;">^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$</span>

文件扩展名效验:<span mp-original-font-size="16" mp-original-line-height="28" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 28px;">^([a-zA-Z]\:|\\)\\([^\\]+\\)*[^\/:*?"<>|]+\.txt(l)?$</span>

判断IE版本：<span mp-original-font-size="16" mp-original-line-height="28" style="margin: 0px;padding: 0px;outline: 0px;max-width: 100%;box-sizing: border-box !important;word-wrap: break-word !important;font-size: 16px;overflow-wrap: break-word !important;line-height: 28px;">^.*MSIE [5-8](?:\.[0-9]+)?(?!.*Trident\/[5-9]\.0).*$</span>

附表: