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<?php $str = 'a\\\\,b,c\\,d'; $str2 = 'a\\\\,b,c\\,d'; var_dump(preg_split('/(?<!(?<!\\\\)\\\\),/', $str)); var_dump(preg_split('/(?<![^\\\\])(?<!\\\\),/', $str2));
Output for git.master, git.master_jit, rfc.property-hooks
array(3) { [0]=> string(3) "a\\" [1]=> string(1) "b" [2]=> string(4) "c\,d" } array(1) { [0]=> string(10) "a\\,b,c\,d" }

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