Java string searching ignoring accents

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Make use of java.text.Normalizer and a shot of regex to get rid of the diacritics.

public static String removeDiacriticalMarks(String string) {
    return Normalizer.normalize(string, Form.NFD)
        .replaceAll("\\p{InCombiningDiacriticalMarks}+", "");
}

Which you can use as follows:

String value = "Joáo";
String comparisonMaterial = removeDiacriticalMarks(value); // Joao

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