How to search/replace quotes within quotes in text?

[a.cedano]

I have multiple scenarios of text and quotes and i need to do replacement.

Scenario A: In text with quotes within quotes i want use: « » as first quotes and “ ” for internal quotes.

Scenario B: In text with only one level of quotes i want to use: “ ”

Then, which GREP(s) i can use for:

Solve scenario A:

Search content as:

«Lorem "ipsum" dolor sit amet»

 or

«Lorem 'ipsum' dolor sit amet»

or 

«Lorem «ipsum» dolor sit amet»

And replace with:

«Lorem “ipsum” dolor sit amet»

Solve scenario B:

Which GREP i can use to search text as:

«Lorem ipsum dolor sit amet»

And replace by:

“Lorem ipsum dolor sit amet”

Thanks for your help.

[Mike Witherell]

Interestingly, quote marks find/change (Text tab) to different characters based on whether the language is English, French, or German (Swiss, Austrian). Your characters are a mixture of English and French quote marks in your example.

Quotation Marks                                  Text                      GREP
Any Double Quotation Mark . . . . . . . . " . . . . . . . . . . . . "
Any Single Quotation Mark . . . . . . . . . . ' . . . . . . . . . . . . . '
Straight Double Quotation Mark " . . .^" . . . . . . . . . . .~"
Double Left Quotation Mark “ . . . . . . ^{ . . . . . . . . . . ~{
Double Right Quotation Mark ” . . . . . .^} . . . . . . . . . . ~}
Straight Single Quotation Mark ' . . . . .^' . . . . . . . . . . . ~'
Single Left Quotation Mark ‘ . . . . . . . . .^[ . . . . . . . . . . ~[
Single Right Quotation Mark ’ . . . . . . . .^] . . . . . . . . . . .~]

In your GREP searches, you might want to make the search a shortest match by adding the ? after your expression.

Interestingly, I cannot find a discrete GREP or metacharacter that represents << or >>. Anyone know of one?