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efaq: Controlling case sensitivity

 
 5.11 How do I control Emacs’s case-sensitivity when searching/replacing?
 ========================================================================
 
 The value of the variable ‘case-fold-search’ determines whether searches
 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.
 
    You can also toggle case sensitivity at will in isearch with ‘M-c’.
 
    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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