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<? $x = "jasldfnjks"; echo strlen($x); echo preg_match('~[0-9a-zA-ZäöüÄÖÜß&]{strlen($x)}~', $x; ?>
based on osH3i
Output for hhvm-3.10.0

Process exited with code 153.
Output for 5.4.34
Parse error: syntax error, unexpected ';' in /in/pAknG on line 4
Process exited with code 255.
Output for 5.4.0 - 5.4.32
<? $x = "jasldfnjks"; echo strlen($x); echo preg_match('~[0-9a-zA-ZäöüÄÖÜß&]{strlen($x)}~', $x; ?>