Merge from origin/emacs-26

615cff4 (origin/emacs-26) Fix process filter documentation (Bug#13400)
beb1d22 Fix query-replace-regexp undo feature

# Conflicts:
#	test/lisp/replace-tests.el

1 files changed, 5 insertions, 2 deletions

diff --git a/lisp/replace.el b/lisp/replace.el
index 7c6c6fc9b7f..ad9be77a79b 100644
--- a/lisp/replace.el
+++ b/lisp/replace.el
@@ -2728,7 +2728,8 @@ characters."
                                    (setq real-match-data
                                          (save-excursion
                                            (goto-char (match-beginning 0))
-                                           (looking-at search-string)
+                                           ;; We must quote the string (Bug#37073)
+                                           (looking-at (regexp-quote search-string))
                                            (match-data t (nth 2 elt)))
                                          noedit
                                          (replace-match-maybe-edit
@@ -2738,7 +2739,9 @@ characters."
                                          real-match-data
                                          (save-excursion
                                            (goto-char (match-beginning 0))
-                                           (looking-at next-replacement)
+                                           (if regexp-flag
+                                               (looking-at next-replacement)
+                                             (looking-at (regexp-quote next-replacement)))
                                            (match-data t (nth 2 elt))))
                                    ;; Set replaced nil to keep in loop
                                    (when (eq def 'undo-all)