$address = "123 Test Street
Reservoir
VIC 3073";
$str = str_replace("\r\n", "\n", $address);
$addressPattern = '/[^0-9a-zA-z,.\-\/\r\n ]+|[\s]{2,}/';
$bool = (!preg_match($addressPattern, $str)) ? "true" : "false";

echo "Bool : " . $bool . "<br>";