How to query-replace with exact match with the exact given word in case-sensetive manner?

Question

I have HELLOWORLD string inside my file.

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My setup:

(defun my-find-orgfiles ()
  (interactive)
  (setq toggle-case-fold-search 0)  ; Turn Off Smart Case Sensitivity
  (find-name-dired "~/folder" "*py"))

(global-set-key (kbd "M-m") 'my-find-orgfiles)

(add-hook 'python-mode-hook
          (lambda ()
            (setq flycheck-python-pylint-executable "~/venv/bin/pylint")
            (setq flycheck-pylintrc "~/.pylintrc")))
(setq case-fold-search nil)

Than, t to toggle marked/unmarked files (thus marking them all, since none were marked). Then I use Q to use query-replace on the marked files. And enter helloword to replace with hello.

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On the minibuffer I face with following:

Query replacing helloworld with HELLO: (? for help)

Than replaces HELLOWORLD into HELLO.

• Here if replacement occurs I want it to replace into hello rather than HELLO, since I enter lower case hello

• Since lower case helloword does not exist in the file, it shouldn't attempt to replace anything.

---

Note: Adding (setq case-fold-search nil) did not help.

Answer 1

Do M-x toggle-case-fold-search (message is Case-Insensitive Search disabled globally) before Q.

toggle-case-fold-search isn't a standard variable but rather a function. Perhaps you wanted to set buffer-local variable case-fold-search in my-find-orgfiles? Or maybe to call toggle-case-fold-search?