What are good alternatives to untrusted input and regex DoS, and how do they compare?

Alternatives to untrusted input and regex DoS in Perl include the use of validation libraries, input sanitization, and employing safe parsing techniques. These methods help enhance application security and performance.

alternatives, untrusted input, regex DoS, Perl security, input validation, input sanitization


        <?php
        // Example: Using filter_var for input validation in PHP
        $email = "user@example.com";
        
        if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
            echo "Valid email address.";
        } else {
            echo "Invalid email address.";
        }
        ?>