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<?php $myinput = 'test <span>1234</span><span>12345</span>test<span>5678</span><span>12345</span>test'; preg_match_all("/<span>(\d{4})<\/span>/", $myinput, $myoutput); print_r($myoutput);
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.6 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
Array ( [0] => Array ( [0] => <span>1234</span> [1] => <span>5678</span> ) [1] => Array ( [0] => 1234 [1] => 5678 ) )

preferences:
249.04 ms | 406 KiB | 379 Q