master fdeb1a3: Mention that Emacs is usually case-insensitive in a couple of places

[Lars Ingebrigtsen]

branch: master
commit fdeb1a3dc77ccac28e6cf91b9cc4aa43f3060e7a
Author: dalanicolai <dalanicolai@gmail.com>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Mention that Emacs is usually case-insensitive in a couple of places
    
    * doc/lispref/searching.texi (Regular Expressions): Mention
    `case-fold-search'.
    
    * lisp/emacs-lisp/re-builder.el (re-builder): Mention case
    sensitivity toggles (bug#47534).
    
    Copyright-paperwork-exempt: yes
---
 doc/lispref/searching.texi    | 5 +++++
 lisp/emacs-lisp/re-builder.el | 7 ++++++-
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/doc/lispref/searching.texi b/doc/lispref/searching.texi
index 16a8e56..99451d0 100644
--- a/doc/lispref/searching.texi
+++ b/doc/lispref/searching.texi
@@ -251,6 +251,11 @@ matches in the target buffer are highlighted.  Each 
parenthesized
 sub-expression of the regexp is shown in a distinct face, which makes
 it easier to verify even very complex regexps.
 
+  Note that by default Emacs search ignores case (@xref{Searching and
+Case}).  To enable case-sensitive regexp search and match, bind
+@code{case-fold-search} to @code{nil} around the code you want to be
+case-sensitive.
+
 @menu
 * Syntax of Regexps::       Rules for writing regular expressions.
 * Regexp Example::          Illustrates regular expression syntax.
diff --git a/lisp/emacs-lisp/re-builder.el b/lisp/emacs-lisp/re-builder.el
index 455fcac..b695dff 100644
--- a/lisp/emacs-lisp/re-builder.el
+++ b/lisp/emacs-lisp/re-builder.el
@@ -341,7 +341,12 @@ the regexp builder.  It displays a buffer named 
\"*RE-Builder*\"
 in another window, initially containing an empty regexp.
 
 As you edit the regexp in the \"*RE-Builder*\" buffer, the
-matching parts of the target buffer will be highlighted."
+matching parts of the target buffer will be highlighted.
+
+Case-sensitivity can be toggled with \\[reb-toggle-case].  The
+regexp builder supports three different forms of input which can
+be set with \\[reb-change-syntax].  More options and details are
+provided in the initial comment of`re-builder.el'."
   (interactive)
   (if (and (string= (buffer-name) reb-buffer)
           (reb-mode-buffer-p))