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  1. or download this
    "my" "dog"            <-- valid
"my" "dog shepherd"   <-- valid
...
my "dog shepherd"     <-- valid
"my "dog"             <-- invalid
my "dog shepherd      <-- invalid
  2. or download this
     
$in =~ /(["]?)[^" ]+\$&\s+ (["]?)[^" ]+\$&/