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@ 2017-07-11T16:04:38Z

<?php

if (isset($_GET['v'])) {
	$var=$_GET['v'];
  
	if (preg_match('/[^A-Z]/', $var)) {
		echo "fail";
    } else {
		echo "success";
    }
}

Output
Performance
VLD
References
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preg_match: documentation ( source)

preferences:dark modelive preview

37.61 ms | 402 KiB | 5 Q