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@ 2024-06-20T23:05:18Z

<?php

$text = <<<TEXT
This is !@#$%^&
TEXT;

echo preg_replace("/[[:alnum:]]+\K(?= [^[:alnum:]])/", ",", $text);

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

69.01 ms | 404 KiB | 5 Q