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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. See Locals. You can also use Case Sensitive Search from the Options menu on your screen.