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run code in 150+ php & hhvm versions
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<?php $str = 'a,b\\\,c,d'; preg_match_all('/(?:\\.|[^,]+)/', $str, $matches); var_dump($matches);
based on 5eA5I
Output for 4.3.0 - 7.1.0
array(1) { [0]=> array(4) { [0]=> string(1) "a" [1]=> string(3) "b\\" [2]=> string(1) "c" [3]=> string(1) "d" } }