$re = '/(?m)^(.+?)\t/u';
$str = '[SetID Size Position Area Weight]
Set01 100,20 200,300 20000 20
Set02 20,30 1000,200 600 5
Set03 40,10 1100,500 4000 60';
preg_match_all($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