$re = '/\(([0-9\-\s,.]+)\)/m';
$str = '(-6.2811957386588855, 106.70141951079609),(-6.281142416506361, 106.70432702536823),(-6.2781776962328815, 106.70438066954853),(-6.2781776962328815, 106.70136586661579)';
preg_match_all($re, $str, $matches, PREG_SET_ORDER, 0);
// Print the entire match result
var_dump($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