What potential pitfalls should be avoided when using preg_match in PHP for password validation?

When using preg_match in PHP for password validation, one potential pitfall to avoid is using insecure or outdated regular expressions that do not adequately enforce strong password requirements. To mitigate this risk, it is important to use a regex pattern that checks for a combination of uppercase and lowercase letters, numbers, and special characters. Additionally, ensure that the password length requirement is also enforced to enhance security. 

$password = "MySecurePassword123!";

if (preg_match('/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[$@$!%*?&])[A-Za-z\d$@$!%*?&]{8,}$/', $password)) {
    echo "Password is strong and meets the requirements.";
} else {
    echo "Password is weak and does not meet the requirements.";
}

Keywords

preg_match PHP password validation regex security

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