Regular expression to find and replace unescaped Non-successive double quotes in CSV file

Question

This is an extension to a related question answered Here

I have a weekly csv file which needs to be parsed. it looks like this.

\"asdf\",\"asdf\",\"as

Answer 1

In vim I used this to remove all the unescaped quotes.

:%s/\v("(,")@!)&((",)@

detailed explanation is,

: - start the vim command
    % - scope of the command is the whole file
    s - search and replace
        / - start of search pattern
        \v - simple regex syntax (rather than vim style)
            (
                " - double quote
                (,") - comma_quote
                @! - not followed by
            )
            & - and
            (
                (",) - quote_comma
                @

this does the job fairly quickly. The only instance this fails is when there are instances of "," pattern in the data.