Are there any potential security risks associated with using regular expressions for email validation in PHP forms?

Using regular expressions for email validation in PHP forms can pose a security risk if the regex pattern is not robust enough. It may allow certain malicious inputs to pass through, leading to potential vulnerabilities like email injection attacks. To mitigate this risk, it is recommended to use PHP's built-in filter_var function with the FILTER_VALIDATE_EMAIL flag for more reliable email validation. 

$email = $_POST['email'];

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    // Valid email address
} else {
    // Invalid email address
}

Keywords

PHP regular expressions email validation security risks forms

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