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<? $x = "jasldfns"; echo preg_match('~[0-9a-zA-Z]{strlen($x)}~', $x); ?>
based on j2N1E
Output for 5.4.34 - 7.1.0
0
Output for 4.3.0 - 5.4.32
<? $x = "jasldfns"; echo preg_match('~[0-9a-zA-Z]{strlen($x)}~', $x); ?>