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run code in 150+ php & hhvm versions
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<?php var_dump( preg_match_all('/((?:[^\\\\]+|(\\\\){2})+)/', "asdf\\\\dsf\\dsfaf", $matches) ); var_dump($matches);
based on 4CtVX
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
int(2) array(3) { [0]=> array(2) { [0]=> string(9) "asdf\\dsf" [1]=> string(5) "dsfaf" } [1]=> array(2) { [0]=> string(9) "asdf\\dsf" [1]=> string(5) "dsfaf" } [2]=> array(2) { [0]=> string(1) "\" [1]=> string(0) "" } }
Output for hhvm-3.10.0

Process exited with code 153.