如何使用preg_match_all提取键和值？

I have a php file containing language variables that look like this:

define('YES', 'Yes');
define('NO', 'No');
define('HOME', 'home');
define('UNKNOWN', 'Unknown');
define('YEARS', 'years');
define('DAYS', 'days');
define('LOADING', ' Long text ...
...end of text');

I need to parse it, extract keys and values for further usage. What would be a REGEX pattern for this scenario?

<?PHP
$STR = "define('YES', 'Yes');
define('NO', 'No');
define('HOME', 'home');
define('UNKNOWN', 'Unknown');
define('YEARS', 'years');
define('DAYS', 'days');
define('LOADING', ' Long text ...
...end of text');";

if( $i = preg_match_all( "/define\(\s*'([^']+)'\,\s*'([^']+)'\);/si" , $STR , $m ) )
{
    print_r( $m );
}
?>

If you are looking to get all the defined constants look at this function get_defined_constants