อยากจะแยกตัว Oparator กับ Operand ตามโค้ดนี้

<?php
function check_ex( $s )
{
	$op = array('+','-','*','/');
	$num = array('0','1','2','3','4','5','6','7','8','9');
	echo preg_match( '/^[0-9]+([\+\-\*\/][0-9]+)+(,[0-9]+([\+\-\*\/][0-9]+)+)*$/' , $s) ? 'ok' : 'wrong';
	echo "<br>";
	echo "<br>";
	if (!preg_match( '/^[0-9]+([\+\-\*\/][0-9]+)+(,[0-9]+([\+\-\*\/][0-9]+)+)*$/' , $s))
	{
	
	echo"Expression Invalid";
	}
		else
		{
			echo"Expression is valid";
				echo "<br>";
			echo"Operand";
			
			echo '<pre>', print_r(explode('+', $s), true),'</pre>';
			
			echo"Operator";
			echo '<pre>', print_r(explode('0', $s), true),'</pre>';

			
		}

}

check_ex("05*65+9+8");

?>