验证以 javascript 分隔的多个电子邮件逗号

Question

I want to validate a string which can be an email or multiple emails separated by commas.

For example:

bill.gates@hotmail.com -> TRUE
bill -> FALSE
bill.gates@microsoft.com,steve.jobs@apple.com" -> TRUE
bill.gates@microsoft.com,steve.jobs@apple.com, bob" -> false
bob,bill.gates@microsoft.com,steve.jobs@apple.com" -> false

I came out with the next code which works with the test cases.

function validateEmail(field) {
    var regex=/\b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b/i;
    return (regex.test(field)) ? true : false;
}

function validateMultipleEmailsCommaSeparated(value) {
    var result = value.split(",");
    for(var i = 0;i < result.length;i++)
    if(!validateEmail(result[i])) 
            return false;           
    return true;
}

Is this the quickest way to do it? What if I want to allow; and, as separator?

Answer 1

You shouldn't match top-level domains with [AZ]{2,4} :

What about .museum or .travel ? What about IDNA domains like .xn--0zwm56d or .xn--11b5bs3a9aj6g ?

Also, it's perfectly valid to have an email-address like "John Doe"@example.org .

In my opinion, all you should check on the client side is if the address contains an @ and if there's at least one . after it. On the server side, you could check if the server exists (you might even want to try connecting to the appropriate SMTP port) or just send out a validation mail.

Everything else is prone to errors as the actual regex to check for valid email addresses looks like this .

---

Also, this

return (regex.test(field)) ? true : false;

is a serious WTF - test() already returns a boolean value!

---

If you want to allow different separators, use a regular expression instead of a string for splitting, eg

value.split(/,|;/)

Answer 2

Use var result = value.split(",") . You end up with an array.

Answer 3

正则表达式：

((\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*)*([,])*)*

Answer 4

In general it is not possible to validate email addresses. Something that is syntactically valid does not necessarily go anywhere, and even if it does whether it will be read.

And even then, covering all the possible syntactically correct addresses (according to the applicable RFC) needs an extremely complex regex (see 1st edition of "Mastering Regular Expressions" (Friedl, O'Reilly) for the 4724 or 6598 character versions, and these probably don't handle IDNs). Eg an apostrophe is a valid character in the local part, and you can have comments inside the email.

Answer 5

let emails = 'test@gmail.com, test2@gmail.com';

It is very simple. You need to just split your array by comma.

By using,

const arrayOfEmail = emails.split(',');

Then you should validate the string using regex,

const pattern = /^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;

// Make common function for check single array pattern
export const validateEmailByString = (email: string) => {
  const emailId = email.replace(/(\r\n|\n|\r| )/gm, ''); // remove blank spaces and new line breaks from string.
  return emailPattern.test(emailId);
}

Then you should just check the emails using,

const isAllEmailValid = arrayOfEmail.every(validateEmailByString);

Thank you.

Answer 6

used this for php preg_match_all()

$pattern = '/([\w+\._%-]+@[\w+\.-]+\.[\w+]{2,4}[^,;\s])/';
$text = 'abc@efg.com, efg, hij@emg.com, ak@efg asfbd@efg.com ab@sdfs.com abc+efg@pqr.com';
preg_match_all($pattern, $text, $match);
var_dump($match);

 array(2) { [0] => array(5) { [0] => string(11) "abc@efg.com" [1] => string(11) "hij@emg.com" [2] => string(13) "asfbd@efg.com" [3] => string(11) "ab@sdfs.com" [4] => string(15) "abc+efg@pqr.com" } [1] => array(5) { [0] => string(11) "abc@efg.com" [1] => string(11) "hij@emg.com" [2] => string(13) "asfbd@efg.com" [3] => string(11) "ab@sdfs.com" [4] => string(15) "abc+efg@pqr.com" } } 

Answer 7

try this

     function validateEmails(string) {
        var regex = /^([\w-\.]+@([\w-]+\.)+[\w-]{2,4})?$/;
        var result = string.replace(/\s/g, "").split(/,|;/);        
        for(var i = 0;i < result.length;i++) {
            if(!regex.test(result[i])) {
                return false;
            }
        }       
        return true;
    }

accepts both comma and semicolon as separator, change that if you want only comma as separator

Answer 8

如何将字符串拆分成一个数组并循环通过它一次只传递一个电子邮件地址？

Answer 9

I used validationEngine and underscore.js to do this:

function validateEmail(field, rules, i, options) {
if (!_.all(field.val().split(","), function(candidate) { return $.trim(candidate).match(options.allrules.email.regex); } ))
    return options.allrules.email.alertText;
}

And then decorated my form field with:

<input class="validate[required,funcCall[validateEmail]]" type="text" name="contact_email" id="contact_email" value=""  />

Answer 10

I would throw an $.trim(result[i]) into that validateMultipleEmailsCommaSeparated function as many people will add the space after their comma.

Of course that is a jQuery thing so do the equivalent your way.