How to negate substitution pattern?

Question

I've the following sample INI file:

Foo=1
Bar=1
Baz=1
Qux=1

and my goal is to set all options to 0 except Foo.

To disable one selected line, I know that I can run:

%s/Foo=\zs.*$/0/

Test command in shell:

$ ex +"%s/Foo=\zs.*$/0/p" -scwq file.ini
Foo=0

How can I negate substitution pattern, for example disabling every other option apart of Foo?

I'm also open for suggestions to use different commands instead to achieve the same result.

Answer 1

You can use :v, e.g. something like this should work: :v/^Foo/s/.*=\zs\d$/0/g