3v4l.org

run code in 150+ php & hhvm versions
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<?php $str = 'e ,a\\,b\\\\,c\\\\\\,d\\\\'; preg_match_all('/(?:[^\x5c,]|\x5c(?:,|$))+/', $str, $matches); var_dump($matches[0]);
based on qhhpq
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(5) { [0]=> string(2) "e " [1]=> string(4) "a\,b" [2]=> string(3) "\,c" [3]=> string(3) "\,d" [4]=> string(1) "\" }