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run code in 200+ php & hhvm versions
Bugs & Features
<?php echo preg_match( '/\\\/', '\\' ); echo preg_match( '/\\\/m', '\\ \\ \\',$assert ); var_dump($assert);
based on ODkWp
Output for 4.3.0 - 7.2.0
11array(1) { [0]=> string(1) "\" }