PHP: preg_match numbers after equal sign [duplicate]

I got this string: 1497=3&1498=41&1499=52&1496=21&1500=6

And i have to extract the number after the equal sign.

I have tried it with:

preg_match('/1498=(S)/', '1497=311&1498=41&1499=52&1496=21&1500=6', $matches);

But i only get the first number 4 and not 41.

Array
(
    [0] => 1498=4
    [1] => 4
)

And i don’t need Match 1 ([0] => 1498=4). So i only need 41 as output.

Thanks a lot.