In a similar vein, you could match the characters before and after using a character class that says "anything but quote", then put those into the replacement string like this: 

$x =~ s/([^"])"([^"])/$1""$2/g;

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In reply to Re: Regex matching on anywhere but the beginning or end of a line by steves
in thread Regex matching on anywhere but the beginning or end of a line by Anonymous Monk

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