Php preg_match_all из документа JSON

Здравствуйте, я хотел бы использовать preg_match_all в PHP для анализа «{» id «: xxxxxxxxxx,» оппонент «» из следующего из документа json.
Я хотел бы получить следующие идентификаторы: 0:
3043248027
3041643291
3043251372
3041727642
3042908044
3041713366

    preg_match_all('/{"id":(.*),"opponent"/', $jogo, $matchesg);
foreach($matchesg[1] as $jog):
echo "<br><br>" . "jogos: " . $jog . "<br>";
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Спасибо.