What are the potential pitfalls of using regular expressions in PHP for input validation?

One potential pitfall of using regular expressions for input validation in PHP is that they can be complex and difficult to maintain. To solve this issue, it is recommended to use built-in PHP functions for input validation, such as filter_var() or ctype functions, which are simpler and more readable. 

// Using filter_var() for input validation
$input = $_POST['input'];

if (filter_var($input, FILTER_VALIDATE_EMAIL)) {
    // Input is a valid email address
} else {
    // Input is not a valid email address
}

Keywords

Regular expressions input validation PHP security vulnerabilities user input

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