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@ 2023-06-01T01:51:02Z

<?php

$strOne = "Programming requires life long learning #learning #stackoverflow #programming";
$strTwo = "\n\n";

echo preg_replace('/#\w/', "$strTwo$0", $strOne, 1);

Output
Performance
VLD
References
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preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

42.52 ms | 1115 KiB | 5 Q