12.6 Searching and Case
All searches in Emacs normally ignore the case of the text they are
searching through; if you specify searching for `FOO', `Foo' and `foo'
are also considered a match. Regexps, and in particular character
sets, are included: `[aB]' matches `a' or `A' or `b' or `B'.
If you want a case-sensitive search, set the variable
`case-fold-search' to `nil'. Then all letters must match exactly,
including case. `case-fold-search' is a per-buffer variable; altering
it affects only the current buffer, but there is a default value which
you can change as well. Note: Locals. You can also use Case
Sensitive Search from the Options menu on your screen.
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