Add and remove backslashes in regexps

These irregularities were found by relint; see
https://lists.gnu.org/archive/html/emacs-devel/2020-01/msg00949.html .

* doc/lispref/modes.texi (Example Major Modes):
* etc/srecode/el.srt:
* lisp/cedet/data-debug.el (data-debug-mode):
* lisp/cedet/semantic/grammar.el (semantic-grammar-mode):
* lisp/cedet/srecode/srt-mode.el (srecode-template-mode):
* lisp/comint.el (comint--unquote&requote-argument):
* lisp/emacs-lisp/lisp-mode.el (lisp-mode):
* lisp/gnus/mm-uu.el (mm-uu-type-alist):
* lisp/progmodes/cc-awk.el (c-awk-harmless-pattern-characters*):
* lisp/progmodes/cfengine.el (cfengine-common-settings):
* lisp/progmodes/cperl-mode.el (cperl-after-sub-regexp, cperl-init-faces):
* lisp/shell.el (shell-chdrive-regexp, shell--unquote&requote-argument):
* lisp/textmodes/tex-mode.el (tex-common-initialization):
Remove duplicated backslashes in character alternatives.

* lisp/emacs-lisp/lisp-mode.el (lisp-el-font-lock-keywords-2):
* lisp/progmodes/opascal.el (opascal--syntax-propertize):
* lisp/progmodes/pascal.el (pascal--syntax-propertize):
Remove backslashes escaping non-special characters.

* lisp/progmodes/fortran.el (fortran-font-lock-keywords-3): Escape '*'.
* lisp/progmodes/perl-mode.el (perl-syntax-propertize-function):
Escape '^'.

1 files changed, 1 insertions, 1 deletions

diff --git a/doc/lispref/modes.texi b/doc/lispref/modes.texi
index f380f1669e0..f8cf4578fc2 100644
--- a/doc/lispref/modes.texi
+++ b/doc/lispref/modes.texi
@@ -1428,7 +1428,7 @@ or to switch back to an existing one."
   (lisp-mode-variables nil t)
   (setq-local find-tag-default-function 'lisp-find-tag-default)
   (setq-local comment-start-skip
-              "\\(\\(^\\|[^\\\\\n]\\)\\(\\\\\\\\\\)*\\)\\(;+\\|#|\\) *")
+              "\\(\\(^\\|[^\\\n]\\)\\(\\\\\\\\\\)*\\)\\(;+\\|#|\\) *")
   (setq imenu-case-fold-search t))
 @end group
 @end smallexample