Replace String
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    This function prompts you for the search pattern and the
    replacement text.  It also prompts for the replace direction.  If
    you want to match the search case, remember to toggle the search
    flag, which can be done at any time.  You can either do prompt or
    no prompt replacing.   Regardless of prompt or no prompt
    replacing, this function actually moves the cursor to the pattern
    and displays it on the screen and replaces the text. If you are
    using TDE on a slow machine, you can see the search/replace taking
    place.  I implemented the function this way because I just like to
    see what the search/replace function is doing.  Press
    Control-Break to stop no prompt replacing.