$re = '/\s*(\+61|61|061)?\s*[^\d\(]?\s*(\(?([0-8][2-8]{0,1})\)?\s*[\D]?\s*([0-9]{4})\s*[\D]?\s*([0-9]{4}))(?:\D{0,16}(\d{0,8}))?/';
$str = '+61 491570156';
preg_match($re, $str, $matches, PREG_OFFSET_CAPTURE, 0);
// Print the entire match result
var_dump($matches);
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for PHP, please visit: http://php.net/manual/en/ref.pcre.php