replace control character ascii into page

first workaround:

  1. Edit the page under wordpress classic editor
    and copy (ctrl-C) the whole to the clipboard.
  2. Open the vim editor
  3. Copy (ctrl-V) the clipboard to the vim window
  4. Replace all control characters with a space
       :%s/[^@-^M]/ /g (ie ctrl-V ctrl- @ and ctrl-V ctrl-M)
  5. Overwrite the page content in wordpress with the new vim content via the clipboard

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