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@ 2014-10-21T10:00:57Z

<?php
$embedCode  = '<iframe width="800" > </iframe>';
echo preg_replace('/(<iframe[^>]*\swidth=")(\d+)("\s.*)/', '${1}' . '666' . '{3}', $embedCode);

Output
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References
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preg_replace: documentation ( source)

preferences:dark modelive preview

40.31 ms | 402 KiB | 5 Q