How to make substitute command respect different cases [duplicate]

Question

Can vim substitute automatically depending on the case ?

like : s/foo/bar/ turns Foo to Bar and foo to bar ?

Answer 1

I think the easier solution to that is to use the abolish plugin by Tim Pope. Once it is installed you can use the :S command. For example if you have this file:

foo
Foo
FOO

And run :%S/foo/bar/ you'll get:

bar
Bar
BAR

It also provides a lot of command to play with different cases.

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Edit As @LucHermitte said, if you already have the :S command used for something else, you might want to use the complete name of abolish's function: :Subvert