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  1. or download this
     
    $myvar =~ /"           # First quote 
    ...
                 )*        # Zero or more 
                )          # End capture 
              \?"/x;       # Followed by a question mark and quote
    
  2. or download this
    $myvar = q{ abc"def??"ghi?"jkl };
    
  3. or download this
    $myvar = q{ abc"def??"ghi?"jkl };
    
    ...
              \?"/sx;       # Followed by a question mark and quote
    
  4. or download this
    matched <def?>