What best practices should be followed when using regular expressions in PHP code?

When using regular expressions in PHP code, it is important to follow best practices to ensure efficient and secure implementation. This includes using delimiters appropriately, escaping special characters, and validating user input to prevent potential security vulnerabilities like code injection. 

// Example of using regular expressions with best practices in PHP
$pattern = '/^[\w.-]+@[a-zA-Z\d.-]+\.[a-zA-Z]{2,6}$/'; // Regular expression pattern for email validation
$email = "example@example.com";

if (preg_match($pattern, $email)) {
    echo "Email is valid";
} else {
    echo "Email is invalid";
}

Keywords

regex PHP preg_match validation pattern

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