The replace function is the simplest option (CTRL+H)

With the wildcard option checked search for

'(*)'
replace with
\1
and with the cursor in the replace box click CTRL+I (italics)

You can then step through the document replacing the texts as required.

Better still create a character style with the attributes you require, then instead of applying italics apply the style. Then when you want to change your mind and format in a different manner you can simply change the style settings and that will be reflected throughout.

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com