Fix some ineffective backslashes in string literals

Deal with lone backslashes that have no effect in string literals,
but indicate that something is amiss.

* lisp/auth-source-pass.el (auth-source-pass-entries):
* lisp/textmodes/artist.el (artist-figlet-get-font-list-windows):
* lisp/org/ob-abc.el (org-babel-expand-body:abc, org-babel-execute:abc):
* lisp/org/ob-forth.el (org-babel-forth-session-execute):
* lisp/vc/vc-git.el (vc-git--program-version):
Add backslash in regexp for correctness.

* lisp/gnus/nnmail.el (nnmail-split-abbrev-alist):
Replace `\||' with `\\|' to follow the obvious regexp intent.

* lisp/org/org-list.el (org-plain-list-ordered-item-terminator):
Add backslash in doc comment so that it appears as intended.

* lisp/progmodes/cc-engine.el (c-forward-decl-or-cast-1, c-end-of-decl-1):
* lisp/progmodes/f90.el (f90-font-lock-keywords-2):
* lisp/progmodes/etags.el (etags-tags-completion-table):
* lisp/progmodes/ruby-mode.el (ruby-syntax-propertize):
* test/lisp/emacs-lisp/cl-print-tests.el (cl-print-tests-1):
Remove superfluous backslashes from regexp.

* test/lisp/emacs-lisp/rx-tests.el (rx-char-any):
Remove superfluous backslash from doc comment.

13 files changed, 16 insertions, 16 deletions

diff --git a/lisp/auth-source-pass.el b/lisp/auth-source-pass.el
index e37cadb07c1..deb805a6e1a 100644
--- a/lisp/auth-source-pass.el
+++ b/lisp/auth-source-pass.el
@@ -189,7 +189,7 @@ often."
   (let ((store-dir (expand-file-name "~/.password-store/")))
     (mapcar
      (lambda (file) (file-name-sans-extension (file-relative-name file store-dir)))
-     (directory-files-recursively store-dir "\.gpg$"))))
+     (directory-files-recursively store-dir "\\.gpg$"))))
 
 (defun auth-source-pass--find-all-by-entry-name (entryname user)
   "Search the store for all entries either matching ENTRYNAME/USER or ENTRYNAME.
diff --git a/lisp/gnus/nnmail.el b/lisp/gnus/nnmail.el
index f6d75252930..a95cdb4a4f8 100644
--- a/lisp/gnus/nnmail.el
+++ b/lisp/gnus/nnmail.el
@@ -489,7 +489,7 @@ Example:
     (from . "from\\|sender\\|resent-from")
     (nato . "to\\|cc\\|resent-to\\|resent-cc")
     (naany . "from\\|to\\|cc\\|sender\\|resent-from\\|resent-to\\|resent-cc")
-    (list . "list-id\\|list-post\\|x-mailing-list\||x-beenthere\\|x-loop"))
+    (list . "list-id\\|list-post\\|x-mailing-list\\|x-beenthere\\|x-loop"))
   "Alist of abbreviations allowed in `nnmail-split-fancy'."
   :group 'nnmail-split
   :type '(repeat (cons :format "%v" symbol regexp)))
diff --git a/lisp/org/ob-abc.el b/lisp/org/ob-abc.el
index cefbe716e15..43ee1d9921b 100644
--- a/lisp/org/ob-abc.el
+++ b/lisp/org/ob-abc.el
@@ -47,7 +47,7 @@
 	     (value (cdr pair)))
 	 (setq body
 	       (replace-regexp-in-string
-		(concat "\$" (regexp-quote name))
+		(concat "\\$" (regexp-quote name))
 		(if (stringp value) value (format "%S" value))
 		body))))
      vars)
@@ -59,7 +59,7 @@
   (message "executing Abc source code block")
   (let* ((cmdline (cdr (assq :cmdline params)))
 	 (out-file (let ((file (cdr (assq :file params))))
-		     (if file (replace-regexp-in-string "\.pdf$" ".ps" file)
+		     (if file (replace-regexp-in-string "\\.pdf$" ".ps" file)
 		       (error "abc code block requires :file header argument"))))
 	 (in-file (org-babel-temp-file "abc-"))
 	 (render (concat "abcm2ps" " " cmdline
diff --git a/lisp/org/ob-forth.el b/lisp/org/ob-forth.el
index 8ca292656a2..88ed964fd77 100644
--- a/lisp/org/ob-forth.el
+++ b/lisp/org/ob-forth.el
@@ -53,7 +53,7 @@ This function is called by `org-babel-execute-src-block'"
 (defun org-babel-forth-session-execute (body params)
   (require 'forth-mode)
   (let ((proc (forth-proc))
-	(rx " \\(\n:\\|compiled\n\\\|ok\n\\)")
+	(rx " \\(\n:\\|compiled\n\\|ok\n\\)")
 	(result-start))
     (with-current-buffer (process-buffer (forth-proc))
       (mapcar (lambda (line)
diff --git a/lisp/org/org-list.el b/lisp/org/org-list.el
index ef85b402f08..22692d224a8 100644
--- a/lisp/org/org-list.el
+++ b/lisp/org/org-list.el
@@ -236,7 +236,7 @@ into
 
 (defcustom org-plain-list-ordered-item-terminator t
   "The character that makes a line with leading number an ordered list item.
-Valid values are ?. and ?\).  To get both terminators, use t.
+Valid values are ?. and ?\\).  To get both terminators, use t.
 
 This variable needs to be set before org.el is loaded.  If you
 need to make a change while Emacs is running, use the customize
diff --git a/lisp/progmodes/cc-engine.el b/lisp/progmodes/cc-engine.el
index fd669280994..cc3753a7ebd 100644
--- a/lisp/progmodes/cc-engine.el
+++ b/lisp/progmodes/cc-engine.el
@@ -8968,7 +8968,7 @@ This function might do hidden buffer changes."
 
 	 (setq at-decl-end
 	       (looking-at (cond ((eq context '<>) "[,>]")
-				 ((not (memq context '(nil top))) "[,\)]")
+				 ((not (memq context '(nil top))) "[,)]")
 				 (t "[,;]"))))
 
 	 ;; Now we've collected info about various characteristics of
@@ -10321,7 +10321,7 @@ comment at the start of cc-engine.el for more info."
 			  ;; Check for `c-opt-block-decls-with-vars-key'
 			  ;; before the first paren.
 			  (c-syntactic-re-search-forward
-			   (concat "[;=\(\[{]\\|\\("
+			   (concat "[;=([{]\\|\\("
 				   c-opt-block-decls-with-vars-key
 				   "\\)")
 			   lim t t t)
@@ -10329,7 +10329,7 @@ comment at the start of cc-engine.el for more info."
 			  (not (eq (char-before) ?_))
 			  ;; Check that the first following paren is
 			  ;; the block.
-			  (c-syntactic-re-search-forward "[;=\(\[{]"
+			  (c-syntactic-re-search-forward "[;=([{]"
 							 lim t t t)
 			  (eq (char-before) ?{))))))
 	    ;; The declaration doesn't have any of the
diff --git a/lisp/progmodes/etags.el b/lisp/progmodes/etags.el
index c2715be5370..910c320ab8f 100644
--- a/lisp/progmodes/etags.el
+++ b/lisp/progmodes/etags.el
@@ -1281,7 +1281,7 @@ buffer-local values of tags table format variables."
       ;; This regexp matches an explicit tag name or the place where
       ;; it would start.
       (while (re-search-forward
-              "[\f\t\n\r()=,; ]?\177\\\(?:\\([^\n\001]+\\)\001\\)?"
+              "[\f\t\n\r()=,; ]?\177\\(?:\\([^\n\001]+\\)\001\\)?"
 	      nil t)
 	(push	(prog1 (if (match-beginning 1)
 			   ;; There is an explicit tag name.
diff --git a/lisp/progmodes/f90.el b/lisp/progmodes/f90.el
index 3ec145b547e..9de80635e9f 100644
--- a/lisp/progmodes/f90.el
+++ b/lisp/progmodes/f90.el
@@ -648,7 +648,7 @@ forall\\|block\\|critical\\)\\)\\_>"
 \\|enumerator\\|procedure\\|\
 logical\\|double[ \t]*precision\\|type[ \t]*(\\(?:\\sw\\|\\s_\\)+)\\|none\\)[ \t]*"
       (1 font-lock-keyword-face) (2 font-lock-type-face))
-    '("\\_<\\(namelist\\|common\\)[ \t]*/\\(\\(?:\\sw\\|\\s_\\)+\\)?\/"
+    '("\\_<\\(namelist\\|common\\)[ \t]*/\\(\\(?:\\sw\\|\\s_\\)+\\)?/"
       (1 font-lock-keyword-face) (2 font-lock-constant-face nil t))
     "\\_<else\\([ \t]*if\\|where\\)?\\_>"
     '("\\(&\\)[ \t]*\\(!\\|$\\)"  (1 font-lock-keyword-face))
diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index 707875d130d..5998ac8e395 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -1867,7 +1867,7 @@ It will be properly highlighted even when the call omits parens.")
       ("^[ \t]*def +\\(`\\)" (1 "_"))
       ;; Ternary operator colon followed by opening paren or bracket
       ;; (semi-important for indentation).
-      ("\\(:\\)\\(?:[\({]\\|\\[[^]]\\)"
+      ("\\(:\\)\\(?:[({]\\|\\[[^]]\\)"
        (1 (string-to-syntax ".")))
       ;; Regular expressions.  Start with matching unescaped slash.
       ("\\(?:\\=\\|[^\\]\\)\\(?:\\\\\\\\\\)*\\(/\\)"
diff --git a/lisp/textmodes/artist.el b/lisp/textmodes/artist.el
index d75a1ca2f92..e9b17795a92 100644
--- a/lisp/textmodes/artist.el
+++ b/lisp/textmodes/artist.el
@@ -2895,7 +2895,7 @@ Returns a list of strings."
        dir-list)
       (mapcar
        (lambda (file)
-         (replace-regexp-in-string "\.flf\\'" "" file))
+         (replace-regexp-in-string "\\.flf\\'" "" file))
        result))))
 
 (defun artist-figlet-choose-font ()
diff --git a/lisp/vc/vc-git.el b/lisp/vc/vc-git.el
index c6806ba5cd4..c990b0659d2 100644
--- a/lisp/vc/vc-git.el
+++ b/lisp/vc/vc-git.el
@@ -253,7 +253,7 @@ The following place holders should be present in the string:
                        ;; Git for Windows appends ".windows.N" to the
                        ;; numerical version reported by Git.
                        (string-match
-                        "git version \\([0-9.]+\\)\\(\.windows.[0-9]+\\)?$"
+                        "git version \\([0-9.]+\\)\\(\\.windows.[0-9]+\\)?$"
                         version-string))
                   (match-string 1 version-string)
                 "0")))))
diff --git a/test/lisp/emacs-lisp/cl-print-tests.el b/test/lisp/emacs-lisp/cl-print-tests.el
index e163fb8a8dd..406c528dce5 100644
--- a/test/lisp/emacs-lisp/cl-print-tests.el
+++ b/test/lisp/emacs-lisp/cl-print-tests.el
@@ -34,7 +34,7 @@
     (let ((print-circle t))
       (should (equal (cl-prin1-to-string `((x . ,x) (y . ,x)))
                      "((x . #1=#s(cl-print--test :a 1 :b 2)) (y . #1#))")))
-    (should (string-match "\\`#f(compiled-function (x) \"[^\"]+\" [^\)]*)\\'"
+    (should (string-match "\\`#f(compiled-function (x) \"[^\"]+\" [^)]*)\\'"
                           (cl-prin1-to-string (symbol-function #'caar))))))
 
 (ert-deftest cl-print-tests-2 ()
diff --git a/test/lisp/emacs-lisp/rx-tests.el b/test/lisp/emacs-lisp/rx-tests.el
index fa3d9b0d5ea..7dd5e3b8de9 100644
--- a/test/lisp/emacs-lisp/rx-tests.el
+++ b/test/lisp/emacs-lisp/rx-tests.el
@@ -25,7 +25,7 @@
 ;;; Code:
 
 (ert-deftest rx-char-any ()
-  "Test character alternatives with `\]' and `-' (Bug#25123)."
+  "Test character alternatives with `]' and `-' (Bug#25123)."
   (should (string-match
            (rx string-start (1+ (char (?\] . ?\{) (?< . ?\]) (?- . ?:)))
                string-end)