javascriptregex

How to validate email by whitelist domain regex

I want to validate domain by whitelist such as : .com , .co.id, .org,

here i have a regex pattern :

/^[_a-z0-9-]+(\.[_a-z0-9-]+)*(\+[a-z0-9-]+)?@[a-z0-9-]+(\.[a-z0-9-]+)*$/i;

so if the user input :

anyone can help me out ? Thank you

Solution

  • You can proceed in two steps: 

    function validateEmail(email) {
   
    //check that the input string is an well formed email 
    var emailFilter = /^([a-zA-Z0-9_.-])+@(([a-zA-Z0-9-])+.)+([a-zA-Z0-9]{2,4})+$/;
    if (!emailFilter.test(email)) {
        return false;
    }

    //check that the input email is in the whitelist
    var s, domainWhitelist = [".com", "co.id", ".org"];
    for (s of domainWhitelist)
      if(email.endsWith(s))
        return true;
    
    //if we reach this point it means that the email is well formed but not in the whitelist
    return false;
}

console.log("validate ->" + validateEmail(""));
console.log("validate abc ->" + validateEmail("abc"));
console.log("validate example@example.gov ->" + validateEmail("example@example.gov"));
console.log("validate example@example.com ->" + validateEmail("example@example.com"));