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(efaq)Controlling case sensitivity

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How do I control Emacs's case-sensitivity when searching/replacing?
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   For searching, the value of the variable `case-fold-search'
determines whether they are case sensitive:

     (setq case-fold-search nil) ; make searches case sensitive
     (setq case-fold-search t)   ; make searches case insensitive

   Similarly, for replacing, the variable `case-replace' determines
whether replacements preserve case.

   To change the case sensitivity just for one major mode, use the major
mode's hook.  For example:

     (add-hook 'FOO-mode-hook
               (lambda ()
                (setq case-fold-search nil)))


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