Search and replace in Visual Studio

Question

In Visual Studio, when I search within a selection, I want to replace the first instance (or second, third, etc.) of a match per line using regular expressions. How would I

Answer 1

I can be done without a regular expression as well:

Replace = foo with = bar.

If a regular expression is needed, one could use:

foo(\d*) = foo(\d*);

Replace with:

foo\1 = bar\2;