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Global search-and-replace operations are not needed as often in Emacs as they are in other editors, but they are available. In addition to the simple M-x replace-string command which is like that found in most editors, there is a M-x query-replace command which asks you, for each occurrence of the pattern, whether to replace it.
The replace commands normally operate on the text from point to the
end of the buffer; however, in Transient Mark mode, when the mark is
active, they operate on the region. The replace commands all replace
one string (or regexp) with one replacement string. It is possible to
perform several replacements in parallel using the command
expand-region-abbrevs (see Expanding Abbrevs).
 In some editors, search-and-replace operations are the only convenient way to make a single change in the text.Search Case Search Other Repeating Search