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How can I validate an email address in JavaScript?

stackoverflow.com › questions › 46155 › how-can-i-validate-an-email-address-in-javascript

Using regular expressions is probably the best way of validating an email address in JavaScript. View a bunch of tests on JSFiddle taken from Chromium.

const validateEmail = (email) => {
  return String(email)
    .toLowerCase()
    .match(
      /^(([^<>()[\]\\.,;:\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,}))$/
    );
};

The following is an example of a regular expression that accepts unicode.

const re =
  /^(([^<>()[\]\.,;:\s@\"]+(\.[^<>()[\]\.,;:\s@\"]+)*)|(\".+\"))@(([^<>()[\]\.,;:\s@\"]+\.)+[^<>()[\]\.,;:\s@\"]{2,})$/i;

Keep in mind that one should not rely on JavaScript validation alone, as JavaScript can be easily disabled by the client. Furthermore, it is important to validate on the server side.

The following snippet of code is an example of JavaScript validating an email address on the client side.

const validateEmail = (email) => {
  return email.match(
    /^(([^<>()[\]\\.,;:\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,}))$/
  );
};

const validate = () => {
  const $result = $('#result');
  const email = $('#email').val();
  $result.text('');

  if(validateEmail(email)){
    $result.text(email + ' is valid.');
    $result.css('color', 'green');
  } else{
    $result.text(email + ' is invalid.');
    $result.css('color', 'red');
  }
  return false;
}

$('#email').on('input', validate);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<label for="email">Enter email address</label>
<input id="email" type="email">

<p id="result"></p>

Stack Overflow

stackoverflow.com › questions › 46155 › how-can-i-validate-an-email-address-in-javascript

html - How can I validate an email address in JavaScript? - Stack Overflow

Top answer

1 of 16

6666

Using regular expressions is probably the best way of validating an email address in JavaScript. View a bunch of tests on JSFiddle taken from Chromium.

const validateEmail = (email) => {
  return String(email)
    .toLowerCase()
    .match(
      /^(([^<>()[\]\\.,;:\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,}))$/
    );
};

The following is an example of a regular expression that accepts unicode.

const re =
  /^(([^<>()[\]\.,;:\s@\"]+(\.[^<>()[\]\.,;:\s@\"]+)*)|(\".+\"))@(([^<>()[\]\.,;:\s@\"]+\.)+[^<>()[\]\.,;:\s@\"]{2,})$/i;

Keep in mind that one should not rely on JavaScript validation alone, as JavaScript can be easily disabled by the client. Furthermore, it is important to validate on the server side.

The following snippet of code is an example of JavaScript validating an email address on the client side.

const validateEmail = (email) => {
  return email.match(
    /^(([^<>()[\]\\.,;:\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,}))$/
  );
};

const validate = () => {
  const $result = $('#result');
  const email = $('#email').val();
  $result.text('');

  if(validateEmail(email)){
    $result.text(email + ' is valid.');
    $result.css('color', 'green');
  } else{
    $result.text(email + ' is invalid.');
    $result.css('color', 'red');
  }
  return false;
}

$('#email').on('input', validate);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<label for="email">Enter email address</label>
<input id="email" type="email">

<p id="result"></p>

2 of 16

1384

I've slightly modified Jaymon's answer for people who want really simple validation in the form of:

[email protected]

The regular expression:

/^\S+@\S+\.\S+$/

To prevent matching multiple @ signs:

/^[^\s@]+@[^\s@]+\.[^\s@]+$/

The above regexes match the whole string, remove the leading and ^ and trailing $ if you want to match anywhere in the string. The example below matches anywhere in the string.

If you do want to match the whole sring, you may want to trim() the string first.

Example JavaScript function:

function validateEmail(email) {
  var re = /\S+@\S+\.\S+/;
  return re.test(email);
}
    
console.log(validateEmail('my email is [email protected]')); // true
    
console.log(validateEmail('my email is anystring@anystring .any')); // false

Medium

medium.com › @sketch.paintings › email-validation-with-javascript-regex-e1b40863ed23

Email validation with JavaScript Regex | by DreamDrafts | Medium

February 4, 2025 - In this article, we’ll explore a simple yet effective JavaScript regular expression (regex) for validating email addresses.

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