[Organization and Sharing] Commonly used regular expressions in PHP development

Regular describes a string matching pattern, but for many people writing regular is "Landry's torture". If you don't need to use it frequently, you won't even think about learning it. This article will sort out and share with you some commonly used regular expressions. Do you want to use regular expressions for free? Come and collect it!

1. Expression of check digits

Numbers:^[0- 9]*$

N-digit number: ^\d{n}$

At least n-digit number: ^\d{ n,}$

m-n digits: ^\d{m,n}$

Numbers starting with zero and non-zero: ^(0|[1-9][0-9]*)$

Numbers starting with non-zero and with up to two decimal places: ^([1-9][0 -9]*) (.[0-9]{1,2})?$

Positive or negative number with 1-2 decimal places: ^(\-)? \d (\.\d{1,2})?$

Positive numbers, negative numbers, and decimals: ^(\-|\ )?\d (\.\d )?$

Positive real numbers with two decimal places: ^[0-9] (.[0-9]{2})?$

Positive real numbers with 1~3 decimal places: ^[0-9] (.[0-9]{1,3})?$

Non-zero positive integers: ^[1-9]\d*$ or ^([1-9][0-9]*){1,3}$ or ^\ ?[1-9][0-9]*$

Non-zero negative integer: ^\-[1-9][]0-9"*$ or ^-[1-9]\d*$

Non-negative integer: ^\d $ or ^[1-9]\d*|0$

Non-positive integer: ^-[1- 9]\d*|0$ or ^((-\d )|(0 ))$

Non-negative floating point number: ^\d (\.\d )?$ Or ^[1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0 |0$

is not positive Floating point number: ^((-\d (\.\d )?)|(0 (\.0 )?))$ or ^(-([1-9]\d*\.\d* |0\.\d*[1-9]\d*))|0?\.0 |0$

Positive floating point number: ^[1-9]\d *\.\d*|0\.\d*[1-9]\d*$ or ^(([0-9] \.[0-9]*[1-9][0-9]* )|([0-9]*[1-9][0-9]*\.[0-9] )|([0-9]*[1-9][0-9]*))$

Negative floating point number: ^-([1-9]\d*\.\d*|0\.\d*[1-9]\d*)$ or ^(-(([0-9] \.[0-9]*[1-9][0-9]*)|([0-9]*[1-9][0-9]*\ .[0-9] )|([0-9]*[1-9][0-9]*)))$

Floating point number: ^(-?\ d )(\.\d )?$ or ^-?([1-9]\d*\.\d*|0\.\d*[1-9]\d*|0?\.0 | 0)$

## 2. Expression of check characters

^[\u4e00-\u9fa5 ]{0,}$

^[A-Za-z0-9] $ or ^[A-Za-z0-9]{4,40}$

^.{3,20}$

^[A-Za-z] $

^[A-Z] $

^[a-z] $

^[A-Za-z0-9] $

^\w $ or ^\w{3,20}

^[\u4E00-\u9FA5A-Za-z0-9_] $

^ [\u4E00-\u9FA5A-Za-z0-9] $ or ^[\u4E00-\u9FA5A-Za-z0-9]{2,20}$

^%&',;=?$\" and other characters: [^%&',;=?$\x22]

~ characters: [^~\x22]

Others

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

Copy after login

3. Special needs Expression

^\w ([- .]\w )*@\w ([-.]\w )*\.\w ([-.] \w )*$

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

[a-zA-z]://[^ \s]* or ^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}$

^(\(\d{3,4}-)|\d{3.4}-)?\d{7,8}$

\d{3}-\d{8}|\d{4}-\d{7}

^\d{15}|\d{18}$

^([0-9]){7,18}(x|X)?$ or ^\d{8,18}|[0-9x]{8,18}|[0- 9X]{8,18}?$

^[a-zA-Z][ a-zA-Z0-9_]{4,15}$

^[a-zA-Z]\w{5,17}$

^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,10}$

^\d{4}-\d{1,2}-\d{1,2}

^(0?[1-9]|1[0-2])$

^ ((0?[1-9])|((1|2)[0-9])|30|31)$

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”：^[1-9][0-9]*$

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：^(0|[1-9][0-9]*)$

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：^(0|-?[1-9][0-9]*)$

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：^[0-9]+(.[0-9]+)?$

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：^[0-9]+(.[0-9]{2})?$

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：^[0-9]+(.[0-9]{1,2})?$

这样就允许用户只写一位小数.下面我们该考虑数字中的逗号了,我们可以这样：^[0-9]{1,3}(,[0-9]{3})*(.[0-9]{1,2})?$

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：^([0-9]+|[0-9]{1,3}(,[0-9]{3})*)(.[0-9]{1,2})?$

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斜杠,一般的错误都在这里

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：[^\x00-\xff](包括汉字在内，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))

空白行的正则表达式：\n\s*\r (可以用来删除空白行)

HTML标记的正则表达式：]*>.*?\1>|<.></.> (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*$或(^\s*)|(\s*$) (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))

IP-v4地址：\\b(?:(?: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]?)\\b (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：<!--(.*?)-->

查找CSS属性:^\\s*[a-zA-Z\\-]+\\s*[:]{1}\\s[a-zA-Z0-9\\s.#]+[;]{1}

提取页面超链接:(<a>]*)(href="https?:\\/\\/)((?!(?:(?:www\\.)?'.implode('|(?:www\\.)?', $follow_list).'))[^" rel="external nofollow" ]+)"((?!.*\\brel=)[^>]*)(?:[^>]*)></a>

提取网页[Organization and Sharing] Commonly used regular expressions in PHP development:\\]*[src] *= *[\\"\\']{0,1}([^\\"\\'\\ >]*)

提取网页颜色代码:^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$

文件扩展名效验:^([a-zA-Z]\\:|\\\\)\\\\([^\\\\]+\\\\)*[^\\/:*?"|]+\\.txt(l)?$

判断IE版本：^.*MSIE [5-8](?:\\.[0-9]+)?(?!.*Trident\\/[5-9]\\.0).*$

附表:

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