Validate an email address in PHP

This article demonstrates how to validate an email address in PHP.

1. Using `filter_var()` function

The filter_var() function filters a variable using a specified filter and returns the filtered data. You can call filter_var() with the FILTER_VALIDATE_EMAIL filter to validate the email address against the addr-spec syntax in RFC-822.

<?php

$email = '[email protected]';

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {

echo 'Valid email address';

} else {

echo 'Invalid email address';

}

Output: Valid email address

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The PHP documentation states that this function will not validate “not latin” domains. Also, it can conflict with RFC-5321 addresses. For example,

<?php

$email = 'уникум@из.рф';

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {

echo 'Valid email address';

} else {

echo 'Invalid email address';

}

Output: Invalid email address

2. Using `preg_match()` function

You can also use a regex to validate email addresses using the preg_match() function. The following regex is taken from the FILTER_VALIDATE_EMAIL source. You can use and redistribute this regex, but keep the below copyright notice.

<?php

$email = '[email protected]';

* http://squiloople.com/

* Feel free to use and redistribute this code. But please keep this copyright notice.

$pattern = '/^(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){255,})(?!(?:(?:\\x22?\\x5C[\\x00-\\x7E]\\x22?)|(?:\\x22?[^\\x5C\\x22]\\x22?)){65,}@)(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22))(?:\\.(?:(?:[\\x21\\x23-\\x27\\x2A\\x2B\\x2D\\x2F-\\x39\\x3D\\x3F\\x5E-\\x7E]+)|(?:\\x22(?:[\\x01-\\x08\\x0B\\x0C\\x0E-\\x1F\\x21\\x23-\\x5B\\x5D-\\x7F]|(?:\\x5C[\\x00-\\x7F]))*\\x22)))*@(?:(?:(?!.*[^.]{64,})(?:(?:(?:xn--)?[a-z0-9]+(?:-+[a-z0-9]+)*\\.){1,126}){1,}(?:(?:[a-z][a-z0-9]*)|(?:(?:xn--)[a-z0-9]+))(?:-+[a-z0-9]+)*)|(?:\\[(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){7})|(?:(?!(?:.*[a-f0-9][:\\]]){7,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,5})?)))|(?:(?:IPv6:(?:(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){5}:)|(?:(?!(?:.*[a-f0-9]:){5,})(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3})?::(?:[a-f0-9]{1,4}(?::[a-f0-9]{1,4}){0,3}:)?)))?(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))(?:\\.(?:(?:25[0-5])|(?:2[0-4][0-9])|(?:1[0-9]{2})|(?:[1-9]?[0-9]))){3}))\\]))$/iD';

if (preg_match($pattern, $email) === 1) {

echo 'Valid email address';

} else {

echo 'Invalid email address';

}

Output: Valid email address

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That’s all about validating an email address in PHP.

Validate an email address in PHP

1. Using filter_var() function

2. Using preg_match() function

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1. Using `filter_var()` function

2. Using `preg_match()` function