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Emacs also has conventional nonincremental search commands, which require you to type the entire search string before searching begins.
To do a nonincremental search, first type C-s RET. This enters the minibuffer to read the search string; terminate the string with RET, and then the search takes place. If the string is not found, the search command signals an error.
When you type C-s RET, the C-s invokes incremental
search as usual. That command is specially programmed to invoke
search-forward, if the string you
specify is empty. (Such an empty argument would otherwise be
useless.) But it does not call
search-forward right away. First
it checks the next input character to see if is C-w,
which specifies a word search.
See section K.3 Word Search.
C-r RET does likewise, for a reverse incremental search.
Forward and backward nonincremental searches are implemented by the
commands may be bound to keys in the usual manner. The feature that you
can get to them via the incremental search commands exists for
historical reasons, and to avoid the need to find key sequences