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  1. or download this
    $_ = q(aaa; ; bbb ; "ccc ; ddd ;"  ee;e  ";"  fff ;);
s/(".+;.+"|;)/$1 ne ';' ? $1 : '&&'/ge;
  2. or download this
    aaa&& && bbb && "ccc ; ddd ;"  ee;e  ";"  fff &&
  3. or download this
    ; " ; " ; " ; " ;
  4. or download this
    $b = 0;
$_ = q(aaa; ; bbb ; "ccc ; ddd ;"  ee;e  ";"  fff ;);
...

output:
aaa&& && bbb && "ccc ; ddd ;"  ee&&e  ";"  fff &&