Find and replace in found regex in Notepad but only 1 character?

Question

Regular Expressions

I have this code.

"asdfasdfasdfasdf"  asdfasdfasdfasdf "asdfasdfasdf" 

 asdfasdfasd. "asdfasdfasdf"

And I want to find the first one, well, what was it called there, in short, this thing
"
, and I want to replace it with this >>.
I find it with this expression
"\w
And when I write << in Notepad replacement, it replaces both characters, how to make it change only
"

Answer 1

Find all first apostrophes
Find all last apostrophes
\b"