By default, searches in SXEmacs ignore the case of the text they are searching through; if you specify searching for ‘FOO’, then ‘Foo’ or ‘foo’ is also considered a match. Regexps, and in particular character sets, are included: thus, ‘[aB]’ would match ‘a’ or ‘A’ or ‘b’ or ‘B’.
If you do not want this feature, set the variable
nil. Then all letters must match
exactly, including case. This is a buffer-local variable; altering the
variable affects only the current buffer. (See Intro to Buffer-Local.) Alternatively, you may change the value of
default-case-fold-search, which is the default value of
case-fold-search for buffers that do not override it.
Note that the user-level incremental search feature handles case distinctions differently. When given a lower case letter, it looks for a match of either case, but when given an upper case letter, it looks for an upper case letter only. But this has nothing to do with the searching functions Lisp functions use.
This variable determines whether the replacement functions should
preserve case. If the variable is
nil, that means to use the
replacement text verbatim. A non-
nil value means to convert the
case of the replacement text according to the text being replaced.
replace-match is where this variable actually has
its effect. See Replacing Match.
This buffer-local variable determines whether searches should ignore
case. If the variable is
nil they do not ignore case; otherwise
they do ignore case.
The value of this variable is the default value for
case-fold-search in buffers that do not override it. This is the