Question

How to validate email address with regular expression in JavaScript

Answer 1

function mail_valid(email) {
    const re = /^[A-Z0-9._%+-]+@([A-Z0-9-]+\.)+[A-Z]{2,4}$/i;
      
    return re.test(String(email));
}
   
console.log(mail_valid("a@email") ? "valid" : "not valid");
   
console.log(mail_valid("a@email.com") ? "valid" : "not valid");
   
   
      
   
   
/*
run:
       
"not valid"
"valid"
       
*/

 

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Answer 2

function mail_valid(email) {
    const 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(String(email));
}
   
console.log(mail_valid("a@email") ? "valid" : "not valid");
   
console.log(mail_valid("a@email.com") ? "valid" : "not valid");
   
   
      
   
   
   
   
/*
run:
       
"not valid"
"valid"
       
*/

 

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