You can also avoid the order of replacement issue by using the fact that you are wanting to restrict your find to a particular typeface.

If you replaced the found Arial character with a different character in a different typeface then the subsequent searches would not find the new character. If it all has to end up as Arial then pick a typeface not in use anywhere and then run a final search and replace to swap anything in that typeface back to Arial.

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Andrew Lockton
Chrysalis Design, Melbourne Australia