JS makes verification email/email address regular

This time I will bring you JS to make a regular verification email/email address. What are the precautions for using JS to make a regular verification email/email address? The following is a practical case, let's take a look.

The rules are defined as follows:

• Use uppercase letters [A-Z], lowercase letters [a-z], numbers [0-9], underline [_], and minus sign It starts with [-] and a period [.], and needs to be repeated one or more times [ ].

• The @ symbol must be included in the middle.

• @After that, you need to connect uppercase letters [A-Z], lowercase letters [a-z], numbers [0-9], underscore [_], minus sign [-] and dot [ .], and needs to be repeated one or more times [ ].

• must end with a period [.] connecting 2 to 4 digits of uppercase and lowercase letters [A-Za-z]{2,4}.

Use the above rules to give the following regular expression:

var pattern = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/;

Complete test code

Test result:

pattern.test('cn42du@163.com') = true;
pattern.test('ifat3@sina.com.cn') = true;
pattern.test('ifat3.it@163. com') = true;
pattern.test('ifat3_-.@42du.cn') = true;
pattern.test('ifat3@42du.online') = false;
pattern.test ('Mao Sanpang@42du.cn') = false;
pattern.test('cn42du@163.com') = true;
pattern.test('ifat3@sina.com.cn') = true;
pattern.test('ifat3.it@163.com') = true;
pattern.test('ifat3_-.@42du.cn') = true;
pattern.test(' ifat3@42du.online') = false;
pattern.test('Mao Sanpang@42du.cn') = false;

Description of Plan 1

Scheme 1 is the most commonly used email regular expression verification scheme and is suitable for most application scenarios. As can be seen from the above test, this expression does not support domain names ending in .online and .store. If you need to be compatible with this type of domain name (more than 4 digits), just adjust the restriction part at the end of the regular expression {2,4} (for example: {2,8}). Another problem is that email usernames cannot include Chinese characters.

Option 2 (revised option 1)

The rules are supplemented as follows:

• The user name can include Chinese [\u4e00- \u9fa5]

• The end of the domain name can be up to 8 digits{2,8}

• The updated regular expression is as follows:

var pattern = /^([A-Za-z0-9_\-\.\u4e00-\u9fa5])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,8})$/;

Complete test code

Test result:

##pattern.test('cn42du@163.com') = true;

pattern.test('ifat3@sina.com.cn') = true;
pattern.test('ifat3.it@163.com') = true;
pattern.test('ifat3_-.@ 42du.cn') = true;
pattern.test('ifat3@42du.online') = true;
pattern.test('Mao Sanpang@42du.cn') = true;

Option 3 (Security)

The regular expression is given as follows:

var pattern = /^([A-Za-z0-9_\-\.])+\@(163.com|qq.com|42du.cn)$/;

pattern.test('cn42du@163.com') = true; pattern.test('ifat3@sina.com.cn') = false; pattern.test('ifat3.it@163.com') = true; pattern.test('ifat3_-.@42du.cn') = true; pattern.test('ifat3@42du.online') = false; pattern.test('毛三胖dd@42du.cn') = false;

var isEmail = function (val) { var pattern = /^([A-Za-z0-9_\-\.])+\@([A-Za-z0-9_\-\.])+\.([A-Za-z]{2,4})$/; var domains= ["qq.com","163.com","vip.163.com","263.net","yeah.net","sohu.com","sina.cn","sina.com","eyou.com","gmail.com","hotmail.com","42du.cn"]; if(pattern.test(val)) { var domain = val.substring(val.indexOf("@")+1); for(var i = 0; i< domains.length; i++) { if(domain == domains[i]) { return true; } } } return false; } // 输出 true isEmail(cn42du@163.com);

302 status code in axios

Encapsulate Vue2 routing navigation hook and use it in actual combat

The above is the detailed content of JS makes verification email/email address regular. For more information, please follow other related articles on the PHP Chinese website!