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is string.gmatch(), string.upper() 7-bit ascii only?

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I am trying to manipulate text with umlauts. string.upper() does not produce upper case version of umlauts like ä,ö,ü etc.
Also the %g pattern, when used in string.gmatch() does not match these umlauts.
Is there anything that can be done about it? Or, am I making a stupid mistake?

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