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@ 2024-06-19T04:46:16Z

<?php

$n = 123;
$str = "some string with tt=789_ and more";
echo preg_replace("/tt=[0-9]+_\K/", $n, $str);

Output
Performance
VLD
References
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preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

31.89 ms | 404 KiB | 5 Q