ERROR with åäö using Word.Interop: Find Replace c#.Net - c#

I have a word document which I pass to a function that super script everything between two "£"'s. The problem is that if I don't have enabled English setting on my computer there will display a error (in swedish) complaining about the matching. I guess it has something to do with this particular line doc.Find.Text = "£([A-Z]{1,5})£"; since the document also contains letter å,ä and ö. However I can't get it to work no matter what I try, I'm really stuck. I'm not an Interop expert so if anyone could help me out I would appreciate it a lot!
public void SuperScript(Word.Range doc)
{
doc.Find.Replacement.Font.Superscript = 1;
doc.Find.MatchWildcards = true;
doc.Find.Text = "£([0-9]{1,5})£";
doc.Find.Replacement.Text = #"\1";
doc.Find.Execute(Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Word.WdReplace.wdReplaceAll, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
doc.Find.Text = "£([A-Z]{1,5})£";
doc.Find.Replacement.Text = #"\1";
doc.Find.Execute(Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Word.WdReplace.wdReplaceAll, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
doc.Find.Text = "£([a-z]{1,5})£";
doc.Find.Replacement.Text = #"\1";
doc.Find.Execute(Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Type.Missing, Word.WdReplace.wdReplaceAll, Type.Missing, Type.Missing, Type.Missing, Type.Missing);
}


I'm just guessing... Hope this is an answer for you...
You could do Something like that "£(\w[^0-9]{1,5})£" or "£(\D{1,5})£ excluding numbers. If you don't care about the type of characters returned, you could just do "£(.{1,5})£"

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