Following from your question and your comment on John Korchok's answer, I think that a Find expression similar to the one you used should work once you know exactly what character precedes the page number. Because the document has been converted from Word to PDF and back to Word, it may be something unexpected.
Select the character in your Word document (easier to see it if you turn on nonprinting characters). Open the macro editor (Alt+F11) and press Ctrl+G to open the Immediate window. In the Immediate window, type
Print Asc(Selection.Text)
and press Enter. The ASCII code of the selected character will appear on the next line. Use that number in the Find expression. Also, be sure the expression uses exactly the same spaces as appear in the lines in the document -- for example, if there is no space between the last visible letter and the end-of-line character, don't put a space there in the Find expression.
It may be useful to refer to https://www.gmayor.com/replace_using_wildcards.htm, especially the table headed "Control Codes that may be used with the search/replace tool". (The table isn't specific to wildcards.)