If I were you I wouldn't adopt that style. Don't use next for nothing :) I'd write something like this

sub csv_split    {
    local $_ = shift || return undef;

    my @array;
    my $count = my $quoted = 0;

    while ( s/(.)// )    {
        if ( $1 eq ',' and !$quoted ) {
             $count++;
        } elsif( $1 eq q/"/ ) {
            $quoted = 1 - $quoted
                unless 
                    $quoted and s/^\"//;
        } else {
            $array[$count] .= $1;
        }
    }

    return @array;
}
[download]

Yes, I know I like whitespace (look at that cascading unless).

I also wouldn't bother to write && except when needed (nothing wrong with and)

update: also, when all you want is to match, use m//.

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