In form validation, using regular expressions to verify correctness is a very frequent operation. This article has collected 15 commonly used javaScript regular expressions. These include user name, password strength, integer, digit, E-mail address (Email), mobile phone number, ID number, URL address, IPv4 address, hexadecimal color, date, QQ number, wechat signal, license plate number, and Chinese regular.

1 The user name is regular

Var uPattern = /^[a-za-z0-9_ -]{4,16}$/; var uPattern = /^[A-za-z0-9_ -]{4,16}$/; // print true console.log(upattern.test ("caibaojian"));Copy the code

2 Password strength is regular

The password must contain at least six characters, including at least one uppercase letter, one lowercase letter, one digit, and one special character. Var pPattern = /^.*(? (=. {6})? =.*\d)(? =.*[A-Z])(? =.*[a-z])(? =. * [! @ # $% ^ & *?] ). * $/; // Output true console.log("=="+ ppattern.test ("caibaojian#"));Copy the code

3 Integer regularization

Var posPattern = /^\d+$/; Var negPattern = /^-\d+$/; Var intPattern = /^-? \d+$/; // Output true console.log(pospattern.test ("42")); // Print true console.log(negpattern.test ("-42")); // Print true console.log(intpattern.test ("-42"));Copy the code

4 Digital regularization

They can be integers or floating-point numbers

Var posPattern = /^\d*\.? \d+$/; Var negPattern = /^-\d*\.? \d+$/; Var numPattern = /^-? \d*\.? \d+$/; The console. The log (posPattern. Test (" 42.2 ")); The console. The log (negPattern. Test (" 42.2 ")); The console. The log (numPattern. Test (" 42.2 "));Copy the code

5 Email regular

Regular var ePattern = / / Email / ^ ([A - Za - z0-9 _ \ - \]) + \ @ ([A - Za - z0-9 _ \ - \]) + \. ([A Za - z] {2, 4}) $/; // Print true console.log(epattern.test ("[email protected]"));Copy the code

6 The mobile phone number is regular

Var mPattern = /^1[34578]\d{9}$/; / / http://caibaojian.com/regexp-example.html / / output true on the console. The log (mPattern. Test (" 15507621888 "));Copy the code

7 Id number is regular

/ / id number (18) regular var cP = / ^ 1-9] [\ d {5} (18 19 | | ([23] \ d)) \ d {2} ((0 [1-9]) | (10, 11 | | 12)) (([0-2] [1-9]) 10 20 | | | | 30 31) \ d {3} [xx] 0-9 $/; // Output true console.log(cp.test ("11010519880605371X"));Copy the code

8 the URL regular

Var urlP= /^((HTTPS? |ftp|file):\/\/)? ([\ \. Da - z -] +) \. ([a-z \.] {2, 6}) (/ \ \ / \ w - *) * \ /? $/; // Print true console.log(urlp.test ("http://caibaojian.com"));Copy the code

9 The IPv4 address is regular

Var ipP = /^(? : (? : 25 [0 to 5] | 2 [0 to 4] [0-9] | [01]? [0-9] [0-9]?) \.) {3} (? : 25 [0 to 5] | 2 [0 to 4] [0-9] | [01]? [0-9] [0-9]?) $/; // Print true console.log(ipp.test ("115.28.47.26"));Copy the code

10 Hexadecimal color is regular

Var cPattern = /^#? ([a-fA-F0-9]{6}|[a-fA-F0-9]{3})$/; // Print true console.log(cpattern.test ("#b8b8b8"));Copy the code

11 Date regularization

/ / date regular, simple, do not make month and date of var dP1 = / ^ \ d {4} (\) \ d {1, 2} \ \ d {1, 2} $1 /; // Print true console.log(dp1.test ("2017-05-11")); // Output true console.log(dp1.test ("2017-15-11")); Var dP2 = /^(? : (? ! 0000) [0-9] {4} - (? : (? : 0 | [1-9] [0-2] 1) - (? : 0 [1-9] [0-9] | | 1 2 [0 to 8]) | (? : 0 [9] 13 - | [0-2] 1) - (? 30) : 29 | | (? : 0 [13578] 1 [02]) - 31) | | (? : [0-9] {2} (? : 0 [48] | [2468] [048] | [13579] [26]) | (? : 0 [48] | [2468] [048] | [13579] [26]) 00) - 02-29) $/; // Output true console.log(dp2.test ("2017-02-11")); // Print false console.log(dp2.test ("2017-15-11")); // Output false console.log(dp2.test ("2017-02-29"));Copy the code

12 QQ number is regular

/ / QQ number regular, 5 to 11 var qqPattern = / ^ (1-9] [0-9] {4, 10} $/; // Output true console.log(qqPattern. Test ("65974040"));Copy the code

13 micro signal is regular

Var wxPattern = /^[a-za-z]([-_a-za-z0-9]{5,19})+$/; // Print true console.log(wxpattern.test ("caibaojian_com"));Copy the code

14. The license plate number is regular

[a-z]{1}[a-z]{1}[A-z]{1}[A-z0-9]{4}[A-z0-9 hang student police Hong Kong and Macao]{1}$/; // Output true console.log(cpattern.test (" guangdong B39006"));Copy the code

15 Contains Chinese regulars

Var cnPattern = /[u4e00-u9fa5]/; // Print true console.log(cnpattern.test (" CAI Baogui "));Copy the code

This article will continue to collect regular validation in the front-end form.