How to do case sensitive tags search in Emacs?

Question

How can I do a case-sensitive tags-search in Emacs?

Answer 1

Building on your answer, this is what you need:

(set-default case-fold-search nil)

which sets the default value, which will affect all buffers that haven't set the value locally.

Answer 2

If you set the variable case-fold-search to nil, then all letters must match exactly, including case.

Correction to Trey Jackson's answer:

(set-default 'case-fold-search nil)

You need to quote the variable.