$re = '/(?:[,\'])(\d+\.?\d*)/';
$str = 'line = \'3520005,"Toronto (Ont.)",C ,F,2503281,2481494,F,F,0.9,1040597,979330,630.1763,3972.4,1\\r\\n';
preg_match_all($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