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-rw-r--r--lisp/emacs-lisp/rx.el3
1 files changed, 2 insertions, 1 deletions
diff --git a/lisp/emacs-lisp/rx.el b/lisp/emacs-lisp/rx.el
index bc16a84b156..c6f9ce6f4a6 100644
--- a/lisp/emacs-lisp/rx.el
+++ b/lisp/emacs-lisp/rx.el
@@ -345,7 +345,8 @@ matches anything."
(defun rx-not (form)
"Parse and produce code from FORM. FORM is `(not ...)'."
(rx-check form)
- (let ((result (rx-to-string (cadr form) 'no-group)))
+ (let ((result (rx-to-string (cadr form) 'no-group))
+ case-fold-search)
(cond ((string-match "\\`\\[^" result)
(if (= (length result) 4)
(substring result 2 3)