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run code in 150+ php & hhvm versions
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<?php echo preg_match( '/\\\/', '\\' ); echo preg_match( '/\\\/m', '\\ \\ \\',$assert ); var_dump($assert);
based on ODkWp
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
11array(1) { [0]=> string(1) "\" }