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run code in 150+ php & hhvm versions
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<?php $str = 'e ,a\\,b\\\\,c\\\\\\,d\\\\'; var_dump(preg_split('/(?<![^\x00-\x5b\x5d-\xFF]\x5c),/', $str));
based on 7q7ms
Output for 4.3.0 - 7.1.0
array(3) { [0]=> string(2) "e " [1]=> string(2) "a\" [2]=> string(12) "b\\,c\\\,d\\" }