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@ 2014-01-17T18:47:16Z

<?php

$string = 'PT3M';
$pattern = 'PT?[0-9]+[SMWYD]';
$replacement = '#';
echo preg_replace($pattern, $replacement, $string);

Output
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preg_replace: documentation ( source)

preferences:dark modelive preview

37.08 ms | 402 KiB | 5 Q