qt实现文本高亮

重载QSyntaxHighlighter的highlightBlock

void MyHighlighter::highlightBlock(const QString &text)
{
    QTextCharFormat myClassFormat;
    myClassFormat.setFontWeight(QFont::Bold);
    myClassFormat.setForeground(Qt::darkMagenta);
    QString pattern = "\\bMy[A-Za-z]+\\b";

    QRegExp expression(pattern);
    int index = text.indexOf(expression);
    while (index >= 0) {
        int length = expression.matchedLength();
        setFormat(index, length, myClassFormat);
        index = text.indexOf(expression, index + length);
    }
}

调用方式：

QTextEdit *editor = new QTextEdit;
MyHighlighter *highlighter = new MyHighlighter(editor->document());