Searching and Replacement
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Like other editors, Emacs has commands for searching for occurrences
of a string. The principal search command is unusual in that it is
"incremental"; it begins to search before you have finished typing the
search string. There are also nonincremental search commands more like
those of other editors.
Besides the usual `replace-string' command that finds all
occurrences of one string and replaces them with another, Emacs has a
more flexible replacement command called `query-replace', which asks
interactively which occurrences to replace.