$re = '/\((.*?);(.*?)\)/';
$str = '{[(0.3;0.43)(10;8.2)(0;0)(0.7888;12.345)]:8.56/13.9}';
preg_match($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