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  1. or download this
    @arr = split /(?=(&&|\|\|))/, $str;
# @arr = ('<chap', '&&', '&&<book', '||', '||<table', '&&', '&&<list')
+;
  2. or download this
    @arr = split /(?=(?:&&|\|\|))/, $str;
# @arr = ('<chap', '&&<book', '||<table', '&&<list');
  3. or download this
    @arr = split /(?=&&|\|\|)/, $str;
# @arr = ('<chap', '&&<book', '||<table', '&&<list');
  4. or download this
    @arr = split /&&|\|\|/, $str;
# @arr = ('<chap', '<book', '<table', '<list');