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I have a simple question about string searching. Let's say that I want to know if city "Muenchen" is found in text. If I don't know the source of text the city might be written like "Muenchen" or "München". I would like to make my search support both versions with single search pattern. Something like: string.find(txt, "m[ü or ue]nchen"). The problem is that the alternatives don't have the same length. Otherwise they could be put to a set. Is there any simple solution to this problem?