使用Java自定义电子邮件验证

Question

I am using Javascript email validation using regular expression.

I am using the below function

function validateEmail(email) { 
     var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
    return re.test(email);
}

It works fine for various email validation scenario. Let say for example

validateEmail('m@s'); // return false

But if I try to validate something like

validateEmail('m@com.com'); // return true

Which is true as per the regular expression.

What I need is, it will also validate that text "com" before and after ".", such a that both the texts should not be the same.

Any help will be appreciated... :)

Answer 1

I have done some cosmetic changes in above code and it works.. :)

Below is the changed function in which valid email is rechecked for the text after "@" but before and after the "."

function validateEmail(email) { 
   var re = /^(([^<>()[\]\\.,;:\s@\"]+(\.[^<>()[\]\\.,;:\s@\"]+)*)|(\".+\"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;  
     if(re.test(email)){   
       var afteratRate = email.substr(email.indexOf("@") + 1); 
       var spmail = afteratRate.split(".");
       if(spmail[0] === spmail[1]){
           return false;
        }
    }
    return re.test(email);
}

Then test for below scenarios

validateEmail('m@.com'); // gives false
validateEmail('m@s.com'); // gives true
validateEmail('test@gmail.com'); // gives true
validateEmail('test@com.com'); // gives false