What are some potential pitfalls of using regular expressions in PHP for form validation?

One potential pitfall of using regular expressions in PHP for form validation is that they can be complex and difficult to maintain, especially for those who are not familiar with regex syntax. To solve this issue, you can create custom validation functions that are more readable and easier to understand. 

function validateEmail($email) {
    return filter_var($email, FILTER_VALIDATE_EMAIL);
}

// Example usage
$email = "example@example.com";
if(validateEmail($email)) {
    echo "Email is valid.";
} else {
    echo "Email is invalid.";
}

Keywords

regular expressions form validation PHP pitfalls error types

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