= Search then Replace string.

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

            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 matching.
                     ex.) "F word\n".
            *       :search same string as previous search command.
                     Use it search changing new-string or direction
                     like as  c * new2 prev, c old2 * etc.
                     * can be used for also replacing string,
                     it mean same replacing string as previos ones.
            \esc    :same as \esc of FINd cmd.
                     Ctrl char specified on .ini Valid_Ctrl_char
                     parameter is inhibitted to input.
                     When replacing from Tab,Tab is replaced after
                     followed padding char is changed to space.
                     When replacing to Tab,old string is replaced to
                     one byte tab char,then following string is shift to
                     the next tab position.So,"c x \t" after "c \t x"
                     dose not back to original status.

            all     :change all old-string in the file.
            allkx   :all without revealing found word on excluded line.
            next    :search forward from cursor position.
            +       :same as next
            prev    :search backward from cursor position.
            -       :same as prev
            first   :search forward from start of the file.
            last    :search backward from end of the file.
            .lab1/2 :Limit search line range using a pair of label
                     on lineno column. line number may be used so as to
                     limit line range with no label on lineno column.
            l-column:left-most column of search range.
            r-column:right-most column of search range.
            LM      :search Left margin only.
            RM      :search Reft margin only.

            -Case sensitive search.
            -Use function key(F6/Shift+F6) to execute same change operation.
             Different from Find,it dose not re-change returning to top or
             bottom of file.
             If needed,use F5 to back around the use F6.
            -Entering operand only and press function key,it start
             search and change(F6) or reverse search and change
             (Shift+F6).Command verb(only abridgement is allowed) also
             can be put on.
            -Tab and its following space is assumed same as space char.
            -Refer "About word" for how to specify string.
             (To delete word,enter like as CHA xxxx "".)
            -F5(Re-find) after Change is case sensitive.