Æ not recognized as a letter (split appart from the word)

Simple line splitting :

    QString blabla = "Unanimes Æquus, Thuscus, sociique Latini, ";
    qDebug() << blabla << blabla.split(QRegularExpression("\\b"));

Wrong result :

"Unanimes Æquus, Thuscus, sociique Latini, " QList("", "Unanimes", " Æ", "quus", ", ", "Thuscus", ", ", "sociique", " ", "Latini", ", ")

The word "Æquus" should not be splitted in "Æ" and "quus".