Validate a comma separated email list

Question

I\'m trying to come up with a regular expression to validate a comma separated email list.

I would like to validate the complete list in the first place, then split

Answer 1

I agree with @crisbeto's comment but if you are sure that this is how you want to do it, you can do it by matching the following regex:

^(\s?[^\s,]+@[^\s,]+\.[^\s,]+\s?,)*(\s?[^\s,]+@[^\s,]+\.[^\s,]+)$

Answer 2

An easier way would be to remove spaces and split the string first:

var emails = emailList.replace(/\s/g,'').split(",");

This will create an array. You can then iterate over the array and check if the element is not empty and a valid emailadres.

var valid = true;
var regex = /^(([^<>()[\]\\.,;:\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,}))$/;

for (var i = 0; i < emails.length; i++) {
     if( emails[i] == "" || ! regex.test(emails[i])){
         valid = false;
     }
}

note: I got the the regex from here

Answer 3

const regExp = new RegExp(/^(\s?[^\s,]+@[^\s,]+\.[^\s,]+\s?,)*(\s?[^\s,]+@[^\s,]+\.[^\s,]+)$/);
const dom = document.getElementById("regExDom");
const result = regExp.test("test@gmail.com,test2@gmail.com,test3@test.com")
console.log("Regex test => ", result)
dom.innerHTML = result;

<div id="regExDom"></div>

Answer 4

I am using the Regex from many years and code is same. I believe this works for every one:

^(\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]{2,4}\s*?,?\s*?)+$

Be happy :)

Answer 5

Also note that you'll want to get rid of extra spaces so an extra step needs to be added as follows:

var emailStr = "felipe@google.com   , felipe2@google.com, emanuel@google.com\n";


function validateEmailList(raw){
    var emails = raw.split(',')


    var valid = true;
    var regex = /^(([^<>()[\]\\.,;:\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,}))$/;

    for (var i = 0; i < emails.length; i++) {
        if( emails[i] === "" || !regex.test(emails[i].replace(/\s/g, ""))){
            valid = false;
        }
    }
    return valid;
}


console.log(validateEmailList(emailStr))

By adding .replace(/\s/g, "") you make sure all spaces including new lines and tabs are removed. the outcome of the sample is true as we are getting rid of all spaces.