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<?php $s = "i want to show you my youtube channel : [youtube id=12341234] and my instagram account : [instagram id=myingaccount213]"; preg_match_all("~\h*(.*?\[[^][]*])~", $s, $matches); print_r($matches[1]);
Output for 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.34, 8.3.0 - 8.3.35, 8.4.1 - 8.4.26, 8.5.0 - 8.5.11
Array ( [0] => i want to show you my youtube channel : [youtube id=12341234] [1] => and my instagram account : [instagram id=myingaccount213] )

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27.01 ms | 1137 KiB | 7 Q