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run code in 200+ php & hhvm versions
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<?php $str = 'a\\\\,b,c\\,d'; var_dump(preg_split('/(?<!(?<!\\\\)\\\\),/', $str));
based on 5khTY
Output for 4.3.0 - 7.2.0
array(3) { [0]=> string(3) "a\\" [1]=> string(1) "b" [2]=> string(4) "c\,d" }