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Email regex
JavaScript

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Email regex

Email

The regular expressions below can be used to validate if a string is an email address and to extract email addresses from a string. This validation method however does not guarantee that the emails validated and extracted actually exist.

JavaScript
JavaScript
Python
Python
Java
Java
C#
C#
PHP
PHP

The basic validation

A simple JavaScript regex to validate string against email format and catch the most obvious syntax errors:

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

Test it!
This is some text inside of a div block.

True

False

Enter a text in the input above to see the result

Example code in Javascript:

// Validate email address
const validateEmailRegex = /^\S+@\S+\.\S+$/;
validateEmailRegex.test('hello@uibakery.io'); // Returns true

// Extract email addresses from a string
const extractEmailRegex = /\S+@\S+\.\S+/g;
'You can reach me out at hello@uibakery.io and contact@uibakery.io'.match(extractEmailRegex); // returns ['hello@uibakery.io', 'contact@uibakery.io']

The more complex email regex

This Javascript regular expression will match 99% of valid email addresses and will not pass validation for email addresses that have, for instance:

  • Dots in the beginning
  • Multiple dots at the end

But at the same time it will allow part after @ to be IP address.

/^[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/

Test it!
This is some text inside of a div block.

True

False

Enter a text in the input above to see the result

Example code in Javascript:

var regex = /^[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*@(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?$/;
regex.test('hello@uibakery.io.'); // returns false
regex.test('hello@192.168.0.1'); // returns true

RFC 5322 compliant regex

This Javascript regular expression is compliant to RFC 5322 standard which allows for the most complete validation. Usually, you should not use it because it is overkill. In most cases apps are not able to handle all emails that this regex allows.

/(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])/

Test it!
This is some text inside of a div block.

True

False

Enter a text in the input above to see the result

Example code in Javascript:

var regex = /(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])/;
regex.test('hello@uibakery.io'); // returns true

Extra information about validating email

As was stated previously, regex email validation can not fully guarantee that email exists and the message can be delivered. The best way how to know for sure that email is valid is to actually send an email to that address because even paid email validation services do not provide a 100% guarantee for that.