Can't remember regular expressions? Here I have sorted out 99 common rules

Number class

 cell-phone number （ With  1  start ）：/^(?:(?:\+|00)86)?1\d{10}$/

 cell-phone number （ With  13  to 19  start ）：/^(?:(?:\+|00)86)?1[3-9]\d{9}$/

 cell-phone number （ Start with the mobile phone number segment published by the Ministry of industry and information technology ）：/^(?:(?:\+|00)86)?1(?:(?:3[\d])|(?:4[5-79])|(?:5[0-35-9])|(?:6[5-7])|(?:7[0-8])|(?:8[\d])|(?:9[189]))\d{8}$/

 Domestic fixed line number ：/\d{3}-\d{8}|\d{4}-\d{7}/

 Mail box number ：/^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/

 Postal Code ：/[1-9]\d{5}(?!\d)/

 ID number ：/^[1-9]\d{5}(?:18|19|20)\d{2}(?:0[1-9]|10|11|12)(?:0[1-9]|[1-2]\d|30|31)\d{3}[\dXx]$/

 Bank card number （ Male 、 Private account ）：/^[1-9]\d{9,29}$/

 license plate number ：/^[ Beijing, Tianjin, Shanghai, Chongqing, Hebei, Henan, Yunnan, Liaoning, Heilongjiang, Hunan, Anhui, Shandong, new Jiangsu, Zhejiang, Jiangxi, Hubei, Guangxi, Gansu, Shanxi, Inner Mongolia, Shaanxi, Jilin, Fujian, Guizhou, Guangdong, Qinghai Tibet, Sichuan, Ningxia and Hainan ][A-HJ-NP-Z][A-HJ-NP-Z0-9]{4,5}[A-HJ-NP-Z0-9 Hang the school police in Hong Kong and Macao ]$/

QQ  Number ：/^[1-9][0-9]{4,10}$/

 WeChat ID ：/^[a-zA-Z][-_a-zA-Z0-9]{5,19}$/

 Version number （ x.y.z ）：/^\d+(?:\.\d+){2}$/

 Legal account 1（ Beginning of letter ,5-16 position , Allow alphanumeric underscores ）：/^[a-zA-Z][a-zA-Z0-9_]{4,15}$/

 Legal account 2（4-16 position , Allow letters , Numbers , Underline , minus sign ）：/^[a-zA-Z0-9_-]{4,16}$/

 Strong password 1（ Must contain a combination of upper and lower case letters and numbers , Special characters cannot be used , The length is in 8-10 Between ）：/^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,10}$/

 Strong password 2（ Must contain letters 、 Numbers 、 Special characters ：**@#$%^& `~()-+=* ）：

/^(?![a-zA-Z]+$)(?![A-Z0-9]+$)(?![A-Z\[email protected]#$%^&* ~()-+=]+$)(?![a-z0-9]+$)(?![a-z\\[email protected]#$%^& *~()-+=]+$)(?![0-9\[email protected]#$%^&* ~()-+=]+$)[a-zA-Z0-9\\[email protected]#$%^&*~()-+=]/

 website ：/^(((ht|f)tps?):\/\/)?(^[email protected]#$%^&*?.\s-?\.)+[a-z]{2,6}\/?/

 The website has a port number ：/^((ht|f)tps?:\/\/)?[\w-]+(\.[\w-]+)+:\d{1,5}\/?$/

ip-v4：/\\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/

ip-v6：/(([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]))/

Digital class

 Only numbers ：/^[0-9]*$/  or  /^\d{1,}$/

 Integers ：/^-?[0-9]\d*$/

 Positive integer ：/^\+?[1-9]\d*$/

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

 Negtive integer ：/^-[1-9]\d*$/

 Non-negative integer ：/^\d+$/

 Floating point numbers ：/^(-?\d+)(\.\d+)?$/

 Positive floating point ：/^[1-9]\d*\.\d*|0\.\d*[1-9]\d*$/

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

 decimal ：/^-?\d+\.\d+$/

 Positive numbers / negative / decimal ：/^(\-|\+)?\d+(\.\d+)?$/

 Positive real numbers are kept after the decimal point  2  position ：/^[0-9]+(.[0-9]{2})?$/

 Positive real numbers are kept after the decimal point  1  To  3  position ：/^[0-9]+(.[0-9]{1,3})?$/

n  Digit number ：/^\d{n}$/

 At least  n  Digit number ：/^\d{n,}$/

m  to  n  Digit number ：/^\d{m,n}$/

 Numbers and letters contain at least one ：/^[A-Za-z0-9]+$/

 Must contain numbers and letters ：/^(?=.*[a-zA-Z])(?=.*\d).+$/

md5  value  ：/^([a-f\d]{32}|[A-F\d]{32})$/

base64  value ：/^\s*data:(?:[a-z]+\/[a-z0-9-+.]+(?:;[a-z-]+=[a-z0-9-]+)?)?(?:;base64)?,([a-z0-9!$&',()*+;=\-._~:@/?%\s]*?)\s*$/i

Character class

 to  n  A character ：/^.{3,20}$/

 Alphabetic characters ：/^[A-Za-z]+$/

 Capitalized English alphabetic characters ：/^[A-Z]+$/

 Lowercase English alphabetic characters ：/^[a-z]+$/

 Chinese characters ：/^[\u4e00-\u9fa5]{0,}$/

 Full angle symbol ：/[\uFF00-\uFFFF]/

 Half angle symbol ：/[\u0000-\u00FF]/

 Chinese characters 、 english 、 Numbers 、 Underline at least one ：/^[\u4E00-\u9FA5A-Za-z0-9_]+$/

 Does not contain characters  “~” ：/[^~\x22]+/

 Characters repeat continuously ：/(.)\1+/

Time class

24 Hour time （HH:mm:ss）：/^(?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d$/

12 Hour time （hh:mm:ss）：/^(?:1[0-2]|0?[1-9]):[0-5]\d:[0-5]\d$/

24 Hour time （HHmmss）：/([0-1]?[0-9]|2[0-3])([0-5][0-9])([0-5][0-9])$/

 date 1（yyyy-MM-dd, Such as  2222-01-01, The year must be 4 position ）：/^\d{4}-\d{1,2}-\d{1,2}/

 date 2（ Such as  333-01-01, The year can be less than 4 position ）：/^\d{1,4}(-)(1[0-2]|0?[1-9])\1(0?[1-9]|[1-2]\d|30|31)$/

 date 3（yyyyMMdd, Such as  20220202）：/^((([0-9]{3}[1-9]|[0-9]{2}[1-9][0-9]{1}|[0-9]{1}[1-9][0-9]{2}|[1-9][0-9]{3})(((0[13578]|1[02])(0[1-9]|[12][0-9]|3[01]))|((0[469]|11)(0[1-9]|[12][0-9]|30))|(02(0[1-9]|[1][0-9]|2[0-8]))))|((([0-9]{2})(0[48]|[2468][048]|[13579][26])|((0[48]|[2468][048]|[3579][26])00))0229))$/

 date + Time 1（YYYYMMDD HH:mm:ss）：/^\d{4}([/:-\S])(1[0-2]|0?[1-9])\1(0?[1-9]|[1-2]\d|30|31) (?:[01]\d|2[0-3]):[0-5]\d:[0-5]\d$/

 date + Time 2：/^[1-9]\d{3}-(0[1-9]|1[0-2])-(0[1-9]|[1-2][0-9]|3[0-1])\s+(20|21|22|23|[0-1]\d):[0-5]\d:[0-5]\d$/

 A year  12  Months （(01～09  or  1～12)）：/^(0?[1-9]|1[0-2])$/

 A month  31  God （01～09  or  1～31）：/^((0?[1-9])|((1|2)[0-9])|30|31)$/

 Yes  31  Day's month ：/^(0?[13578]|1[02])$/

 Yes  30  Days and months ：/(0[469]|11)-(0[1-9]|[12][0-9]|30)/

2  month  28  God （"02-28"）：/^02-(0[1-9]|[1][0-9]|2[0-8])$/

 Leap year ：/^(((19|20)([13579][26]|[2468][048]|0[48]))|(2000))$/

 Leap year  2  month （ such as  2008-02-01）：/^(((19|20)([13579][26]|[2468][048]|0[48]))|(2000))-0?2-(0?[1-9]|[12]\d)$/

 date （ Including leap years 、 Judgment of big and small months ）：/((((19|20)\d{2})-(0?(1|[3-9])|1[012])-(0?[1-9]|[12]\d|30))|(((19|20)\d{2})-(0?[13578]|1[02])-31)|(((19|20)\d{2})-0?2-(0?[1-9]|1\d|2[0-8]))|((((19|20)([13579][26]|[2468][048]|0[48]))|(2000))-0?2-29))$/

 Year range - year （ such as  19  -  20  year ）：/^((19|20)\d{2})$/

 Year range - years （ such as  1999-01）：/^((((19|20)\d{2})-(0?[13-9]|1[012]))|(((19|20)\d{2})-(0?[13578]|1[02]))|(((19|20)\d{2})-0?2)|((((19|20)([13579][26]|[2468][048]|0[48]))|(2000))-0?2))$/

 Year range - Specific date （ such as  1999-01-01）：/^((((19|20)\d{2})-(0?[13-9]|1[012])-(0?[1-9]|[12]\d|30))|(((19|20)\d{2})-(0?[13578]|1[02])-31)|(((19|20)\d{2})-0?2-(0?[1-9]|1\d|2[0-8]))|((((19|20)([13579][26]|[2468][048]|0[48]))|(2000))-0?2-29))$/.test('2021-02-21')$/

 Year range - Specific date （ The interval symbol can be  - /  Or empty ）：/^(?:(?:1[6-9]|[2-9][0-9])[0-9]{2}([-/.]?)(?:(?:0?[1-9]|1[0-2])\1(?:0?[1-9]|1[0-9]|2[0-8])|(?:0?[13-9]|1[0-2])\1(?:29|30)|(?:0?[13578]|1[02])\1(?:31))|(?:(?:1[6-9]|[2-9][0-9])(?:0[48]|[2468][048]|[13579][26])|(?:16|[2468][048]|[3579][26])00)([-/.]?)0?2\2(?:29))$/

Procedure class

16 Binary color ：/^#?([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/

 Extract web page color code ：/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})$/

 Video link address ：/^https?:\/\/(.+\/)+.+(\.(swf|avi|flv|mpg|rm|mov|wav|asf|3gp|mkv|rmvb|mp4))$/i

 Picture link address ：/^https?:\/\/(.+\/)+.+(\.(gif|png|jpg|jpeg|webp|svg|psd|bmp|tif))$/i

mac  Address ：/^((([a-f0-9]{2}:){5})|(([a-f0-9]{2}-){5}))[a-f0-9]{2}$/i

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

 File extension validation ：/^([a-zA-Z]\\:|\\\\)\\\\([^\\\\]+\\\\)*[^\\/:*?"<>|]+\\.txt(l)?$/

java Package name （x.x.x）：/^([a-zA-Z_]\w*)+([.][a-zA-Z_]\w*)+$/

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

html  notes ：/<!--[\s\S]*?-->/g

html  label 1：/<(\w+)[^>]*>(.*?<\/\1>)?/

html  label 2：/<(\S*?)[^>]*>.*?</\1>|<.*? />/

 First and last white space characters ：/^\s*|\s*$/

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

 Extract page hyperlinks :/(<a\\s*(?!.*\\brel=)[^>]*)(href="https?:\\/\\/)((?!(?:(?:www\\.)?'.implode('|(?:www\\.)?', $follow_list).'))[^" rel="external nofollow" ]+)"((?!.*\\brel=)[^>]*)(?:[^>]*)>/

 Take pictures of web pages ：/\\< *[img][^\\\\>]*[src] *= *[\\"\\']{0,1}([^\\"\\'\\ >]*)/

 Thunderbolt link ：/^thunder:\/\/[a-zA-Z0-9]+=$/

ed2k link ：/^ed2k:\/\/|file|.+|\/$/

linux" file " route ：/^\/(\w+\/)+\w+\.\w+$/

window Next " file " route ：/^[a-zA-Z]:\\(?:\w+\\)*\w+\.\w+$/

lifestyle

 amount of money （ loose , It can be negative 、 The first can be 0, It supports thousand digit separation ）：/^-?\d+(,\d{3})*(\.\d{1,2})?$/

 amount of money （ Greater than  0 , Two decimal places ）：/(^[1-9]{1}[0-9]*$)|(^[0-9]*\.[0-9]{2}$)/

 amount of money （ Strictly , Not negative 、 Up to two digits after the decimal point , The first is not 0）：/(^[1-9]([0-9]+)?(\.[0-9]{1,2})?$)|(^(0){1}$)|(^[0-9]\.[0-9]([0-9])?$)/

 passport ：/(^[EeKkGgDdSsPpHh]\d{8}$)|(^(([Ee][a-fA-F])|([DdSsPp][Ee])|([Kk][Jj])|([Mm][Aa])|(1[45]))\d{7}$)/

 Hong Kong Identity Card ：/^[a-zA-Z]\d{6}\([\dA]\)$/

 Macao identity card ：/^[1|5|7]\d{6}\(\d\)$/

 Wan Wan ID card ：/^[a-zA-Z][0-9]{9}$/

 Stock code ：/^(s[hz]|S[HZ])(000[\d]{3}|002[\d]{3}|300[\d]{3}|600[\d]{3}|60[\d]{4})$/

 Not included  abc  's words ：/\b((?!abc)\w)+\b/

Summary ：

This article has sorted out a wave of regularities , Many of them also learn while watching

If there is any supplementary , Feel free to leave a comment , Or there are mistakes , Welcome to come up with , Revise now . I hope I can learn from your regularity 、 It helps to use ~