A family of Microsoft word processing software products for creating web, email, and print documents.
If you're using the dialog box, first click the More button and check the box for "Use wildcards".
In the Find What box, enter the expression
[^34^0147^0148?]
Leave the Replace With box empty, and click the Replace All button. (The three numeric codes are the ASCII values of the straight quote, opening curly quote, and closing curly quote, respectively.)
If you're doing this with a macro, use code like this:
Dim rg As Range
Set rg = ActiveDocument.Range
With rg.Find
.Text = "[^34^0147^0148?]"
.Replacement.Text = ""
.MatchWildcards = True
.Execute Replace:=wdReplaceAll
End With