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<?php $testString = "Buy Widgets 20% discount with coupon code WID2010 by Friday"; preg_match("/(?=\w*[a-z])(?=\w*[0-9])\w+/i", $testString, $matches); print_r($matches); ?>
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result: Success time: 0.02s memory: 13112 kB returned value: 0
Array (  => WID2010 )