How to get the index of row which contains a specific string?

[adutzu89]

I have a QComboBox from which I want to extract the index of a row that contains a specific row. How can I acomplish that?
Example:

QSqlQuery qsCat("select categID,numeCateg from categ order by numeCateg");
    categorie->addItem("Categorie");
    while(qsCat.next()){
        categId=qsCat.value("categID").toString();
        numeCat=qsCat.value("numeCateg").toString();
        categorie->addItem(numeCat,categId);
    }

QSqlQuery qsCat("select categID,numeCateg from categ order by numeCateg");
    categorie->addItem("Categorie");
    while(qsCat.next()){
        categId=qsCat.value("categID").toString();
        numeCat=qsCat.value("numeCateg").toString();
        categorie->addItem(numeCat,categId);
    }

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For the example let's say that

categorie->addItem()

categorie->addItem()

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inserts multiple rows from which I have also

categorie->addItem("Administrator","2")

categorie->addItem("Administrator","2")

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I would like then to use categorie->setCurrentIndex(int index) where index=index where the item has "Administrator".

Thank you