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  1. or download this
    $a = "12||23||34||45";

@a = split("\|\|", $a);
print join(",", @a);
  2. or download this
    12,23,34,45
  3. or download this
    1,2,|,|,2,3,|,|,3,4,|,|,4,5
  4. or download this
    $a = "12||23||34||45";

@a = split(/\|\|/, $a);
print join(",", @a);
  5. or download this
    $a = "12||23||34||45";

@a = split("\\|\\|", $a);
print join(",", @a);