Hello regular expression experts,

There has never been a string manipulation problem I couldn't resolve with regular expressions until now, at least in an elegant manner using just one step. Here is the sample data I'm working with:

> 
> 0,"section1","(7) Delivery of
>  'certificate' outside the United
>  States prohibited. Since both section
>  339 of the 1940 statute, 68/ and
>  section 341 of the present law are
>  explicit in their statement that the
>  certificate shall be furnished the
>  citizen, only if such individual is at
>  the time within the United States, it
>  is clear that the document could not
>  and cannot be delivered outside the
>  United States.",http://www.google.com/
> 
> 
> 1,"section2",,http://www.google.com/
> 
> 
> 2,"section3",",,",http://www.google.com/
> 
> 
> 

This is a section of a much larger CSV file. With one elegant regular expression, I'd like to replace only all the commas that occur within the double quotes with an underscore character (\_). It is important that the regular expression does NOT replace any commas outside the quotes because that would mess up the CSV data structure.

Thanks,
Tom

--

CLARIFICATION:

Sorry guys, I posted the question without fully clarifying my situation, so let me summarize below:

* Assume that quotes within quotes are already escaped (quotes within quotes in a CSV file saved by Excel are represented by `""` or `"""` etc., so they are easily replaced beforehand).
* I am working within JavaScript.

Using the sample text above, here is what it SHOULD look like after running the regular expression replacement (there should be a total of 5 replacements):

> 
> 0,"section1","(7) Delivery of
>  'certificate' outside the United
>  States prohibited. Since both section
>  339 of the 1940 statute\_ 68/ and
>  section 341 of the present law are
>  explicit in their statement that the
>  certificate shall be furnished the
>  citizen\_ only if such individual is at
>  the time within the United States\_ it
>  is clear that the document could not
>  and cannot be delivered outside the
>  United States.",http://www.google.com/
> 
> 
> 1,"section2",,http://www.google.com/
> 
> 
> 2,"section3","\_\_",http://www.google.com/
> 
> 
>