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@ 2014-05-30T08:03:38Z

<?php
$orderNumber = '002086S023Y9';
if (preg_match('/(.*[A-Z])[0-9a-z]$/', $orderNumber, $matches) === 0) {
	echo $orderNumber;
}

echo $matches[1];

Output
Performance
VLD
References
Branches

preg_match: documentation ( source)

preferences:dark modelive preview

35.83 ms | 402 KiB | 5 Q