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@ 2015-01-21T09:58:26Z

<?php

$subject = 'OBKFA4F26ORJI3ALFYI3QB4ZN';
$expr = '/.{5}(?!$)/';

var_dump(preg_replace($expr, '$0-', $subject));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
preg_replace: documentation ( source)

preferences:dark modelive preview

15.58 ms | 402 KiB | 5 Q