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<?php
 
$str = '1|2\\|2|3\\\\|4\\\\\\|4';
echo $str . PHP_EOL;
$r   = preg_split('~\\\\.(*SKIP)(*FAIL)|\\|~s', $str);
var_dump($r);

Success #stdin #stdout 0.02s 52472KB

stdin

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Standard input is empty

stdout

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1|2\|2|3\\|4\\\|4
array(4) {
  [0]=>
  string(1) "1"
  [1]=>
  string(4) "2\|2"
  [2]=>
  string(3) "3\\"
  [3]=>
  string(6) "4\\\|4"
}

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language:

PHP (php 7.3.5)

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