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@ 2014-07-24T13:00:34Z

<?php
echo 
    preg_replace('/([\?&]clientId=)[0-9a-f]{0,20}/', '$1XXX', '/page?clientId=&amp;url=ht');

Output
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preg_replace: documentation ( source)

preferences:dark modelive preview

39.38 ms | 402 KiB | 5 Q