defaults. They also have separate search rings that you can access with
@kbd{M-p} and @kbd{M-n}.
+@vindex search-whitespace-regexp
If you type @key{SPC} in incremental regexp search, it matches any
-sequence of whitespace characters, including newlines. If you want
-to match just a space, type @kbd{C-q @key{SPC}}.
+sequence of whitespace characters, including newlines. If you want to
+match just a space, type @kbd{C-q @key{SPC}}. You can control what a
+bare spece matches by setting the variable
+@code{search-whitespace-regexp} to the desired regexp.
Note that adding characters to the regexp in an incremental regexp
search can make the cursor move back and start again. For example, if
(@pxref{Replace}) and the minibuffer history matching commands
(@pxref{Minibuffer History}).
+ Several related variables control case-sensitivity of searching and
+matching for specific commands or activities. For instance,
+@code{tags-case-fold-search} controls case sensitivity for
+@code{find-tag}. To find these variables, do @kbd{M-x
+apropos-variable @key{RET} case-fold-search @key{RET}}.
+
@node Replace
@section Replacement Commands
@cindex replacement