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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[0]);
based on mMd1D
Output for 4.3.0 - 5.6.21, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(5) { [0]=> string(1) "a" [1]=> string(1) "b" [2]=> string(1) "\" [3]=> string(1) "c" [4]=> string(1) "d" }