How can the use of regular expressions for email validation in PHP be optimized for efficiency and accuracy?

Regular expressions can be optimized for email validation in PHP by using a more precise pattern that accurately matches valid email addresses while avoiding unnecessary complexity. This can improve both efficiency and accuracy of the validation process. Additionally, using built-in PHP functions like filter_var() with the FILTER_VALIDATE_EMAIL filter can provide a more reliable and efficient way to validate email addresses.

$email = "example@example.com";

if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "Valid email address";
} else {
    echo "Invalid email address";
}