$re = '/.*\\\\(.*)\\\\(.*)\\\\(.*?)( \((\d{4})\))?\\\\(\d+)-(.*)\.flac$/i';
$str = 'c:\\Users\\Me\\Music\\FLAC\\Rock\\The Doors\\Strange Days (1967)\\07-People Are Strange.flac';
preg_match($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