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<?php $str = 'a\\\\\\,b\\\\,c\\,d'; preg_match_all('/(?:(?:\\\\.)|[^\\\\,])+(?<=,|$)/',$str,$matches); var_dump($matches);
Output for git.master, git.master_jit, rfc.property-hooks
array(1) { [0]=> array(2) { [0]=> string(5) "a\\\," [1]=> string(6) "\,c\,d" } }

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