Qt官方示例-语法高亮器

struct HighlightingRule
{
    QRegularExpression pattern;
    QTextCharFormat format;
};
QVector<HighlightingRule> highlightingRules;

void Highlighter::highlightBlock(const QString &text)
{
    foreach (const HighlightingRule &rule, highlightingRules) {
        QRegularExpressionMatchIterator matchIterator = rule.pattern.globalMatch(text);
        while (matchIterator.hasNext()) {
            QRegularExpressionMatch match = matchIterator.next();
            setFormat(match.capturedStart(), match.capturedLength(), rule.format);
        }
    }
    ...
}

QTextCharFormat keywordFormat; // 关键词
QTextCharFormat classFormat; // 类名
QTextCharFormat singleLineCommentFormat; // 单行注释
QTextCharFormat multiLineCommentFormat; // 多行注释
QTextCharFormat quotationFormat; // 头文件引用
QTextCharFormat functionFormat; // 函数

HighlightingRule rule;

classFormat.setFontWeight(QFont::Bold);
classFormat.setForeground(Qt::darkMagenta);
rule.pattern = QRegularExpression("\\bQ[A-Za-z]+\\b"); // 配置"类名"正则模式
rule.format = classFormat; // 配置"类名"的文本格式
highlightingRules.append(rule); // 添加到高亮显示规则容器,用于文本刷新

C:\Qt\{你的Qt版本}\Examples\{你的Qt版本}\widgets\richtext\syntaxhighlighter

https://doc.qt.io/qt-5/qtwidgets-richtext-syntaxhighlighter-example.html