= Search then Replace string.

        {CHAnge | CNX | IC | ICN} {(old-string) | * | \esc} {(new-string) | * | \esc}
                     [all | next | + | prev | - | first | last]
                     [-nx] [.lab1 .lab2] [l-column | LM | RM [r-column]]

                    ( "\" = 0x5c = backslash )

            CHA     :All line search including excluded line. Case Sensitive.
            CNX     :All line search excluding excluded line. Case Sensitive.
            IC      :All line search including excluded line. Case In-Sensitive.
            ICN     :All line search excluding excluded line. Case In-Sensitive.
            old-string/new-string
                    :use quotation for space embedded or special
                     string as following.
                     ex.) "F '.exe'", "F 'set up'".
                     Word followed by "\n" means end-of-line mat