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@ 2014-04-09T09:33:46Z

<?php
$text = "234pLdfv";
$text = preg_replace('~[^pLd]+~u', '-', $text);
echo $text;

Output
Performance
VLD
References
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preg_replace: documentation ( source)

preferences:dark modelive preview

45.1 ms | 402 KiB | 5 Q