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12 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 non-incremental 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
fancy replacement command called `query-replace' which asks
interactively which occurrences to replace.

Incremental Search

Search happens as you type the string.

Non-Incremental Search

Specify entire string and then search.

Word Search

Search for sequence of words.

Regexp Search

Search for match for a regexp.

Regexps

Syntax of regular expressions.

Search Case

To ignore case while searching, or not.

Replace

Search, and replace some or all matches.

Other Repeating Search

Operating on all matches for some regexp.