Ugh. What if you have a title of 'Why "foo", "bar", and "baz"?' and it gets written to a CSV file as: ...,16,"Why "foo", "bar", and "baz"?",20,... then how do you expect to be able to tell which "s need to be escaped??

Well, I'll try me best... Let's assume that no title contains a string matching /",\S/ and that there is never whitespace after a comma in your CSV file.

s{
    \G(
        [^",]+
    |
        "(.*?)"
    )(,(?=\S)|$)
}{
    if(  ! $2  ) {
        $1.$3;
    } else {
        my $f= $2;
        $f =~ s/"/""/g;
        '"'.$f.'"'.$2;
    }
}gx;
[download]

If you do have whitespace after commas, then an alternate solution would be to assume that all titles that contain "s always contain an even number of quotes and that the first character after the first quote of a pair isn't a comma:

s{
    \G(
        [^",]+
    |
        "((?:
            [^"]+
        |   ""
        |   "[^",][^"]*"
        ))*"
    )(,|$)
}{
    if(  ! $2  ) {
        $1.$3;
    } else {
        my $f= $2;
        $f =~ s/"/""/g;
        '"'.$f.'"'.$2;
    }
}gx;
[download]

I hope one of those helps. (Sorry, they aren't tested. Just tell me which one matches your situation and I'll be happy to help if there are bugs.)

        - tye (but my friends call me "Tye")