有没有办法在QML TextEdit的selectedText属性中用替代文本替换<img>标签？

import QtQuick 2.0

TextEdit {
    id: textEdit
    width: 400
    height: 200

    function replaceImgTag() {
        var selectedText = textEdit.selectedText;
        var replacedText = selectedText.replace(/<img[^>]*>/g, "替代文本");
        textEdit.selectedText = replacedText;
    }

    Keys.onReturnPressed: {
        replaceImgTag();
    }
}