<?php
$var = '(1) - (2)';
preg_match('#\((\d+)\) - \((\d+)\)#', $var, $output);
array_shift($output); //Remove o primeiro item, pois não vai usa-lo
echo 'Primeiro número: ', $output[0], PHP_EOL;
echo 'Segundo número: ', $output[1], PHP_EOL;
PD9waHAKCiR2YXIgPSAnKDEpIC0gKDIpJzsKCnByZWdfbWF0Y2goJyNcKChcZCspXCkgLSBcKChcZCspXCkjJywgJHZhciwgJG91dHB1dCk7CgphcnJheV9zaGlmdCgkb3V0cHV0KTsgLy9SZW1vdmUgbyBwcmltZWlybyBpdGVtLCBwb2lzIG7Do28gdmFpIHVzYS1sbwoKZWNobyAnUHJpbWVpcm8gbsO6bWVybzogJywgJG91dHB1dFswXSwgUEhQX0VPTDsKZWNobyAnU2VndW5kbyBuw7ptZXJvOiAnLCAkb3V0cHV0WzFdLCBQSFBfRU9MOw==