<?php $str = 'e |a\\|b\\\\|c\\\\\\|d\\'; preg_match_all('/(?:[^\x5c\|]|\x5c(?:.|$))+/', $str, $matches); var_dump($str, $matches[0]); $result = preg_split('/(?<!\x5c)(?:\x5c.)*\K\|/s', $str); var_dump($result);
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