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run code in 150+ php & hhvm versions
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<?php echo '<pre>'; $a = ' \\'; echo $a.'<br>'; if (preg_match('%[\\\]{2}%i', $a, $regs)) { var_dump($regs); } else { echo 'Failed.'; }
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
<pre> \<br>Failed.