Check if an email is valid with PHP

if(preg_match('/^([a-zA-Z0-9])+([a-zA-Z0-9\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\._-]+)+$/', $email_to_test) && filter_var($email_to_test, FILTER_VALIDATE_EMAIL)) {
echo 'is valid!';
} else {
echo 'is invalid! =(';
}

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