$re = '/(\w+)(?:=([^\s;][^;\n]*))?/m';
$str = 'Name=Value; expires=Tue, 01 Jan 2018 00:00:00 GMT; domain=.site.com; path=/; httponly
Name=Another_Value; expires=Wed, 02 Jan 2019 00:00:00 GMT; domain=.another_site.com; path=/newpath; httponly';
preg_match_all($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