qt的高亮显示主要是使用qsyntaxhighlighter类,由于qsyntaxhighlighter是抽象基类,所以需要继承并自己实现

//头文件

#ifndef MARKDOWN_HIGHLIGHTER_H

#define MARKDOWN_HIGHLIGHTER_H

#include 
    

#include 
    

#include 
    

#include 
    

#include 
    

#include 
    

#include 
    

#include 
    

#include 
    

#include 
    

class markdown_highlighter : public QSyntaxHighlighter

{

public:

markdown_highlighter(QTextEdit *parent = 0);

void highlightBlock(const QString &text);

void SetColorText(const QString &str, const QColor &color);

void clearRules();

private:

struct HighlightingRule

{

QRegExp pattern;

QTextCharFormat format;

};

QVector
    
      highlightingRules;
    

};

#endif // MARKDOWN_HIGHLIGHTER_H

//cpp文件

#include "markdown_highlighter.h"

markdown_highlighter::markdown_highlighter(QTextEdit *parent)

: QSyntaxHighlighter(parent)

{

highlightingRules.clear();

}

void markdown_highlighter::highlightBlock(const QString &text)

{

foreach (HighlightingRule rule, highlightingRules)

{

QRegExp expression(rule.pattern);

int index = text.indexOf(expression);

while (index >= 0)

{

int length = expression.matchedLength();

setFormat(index, length, rule.format);

index = text.indexOf(expression, index + length);

}

}

}

void markdown_highlighter::SetColorText(const QString &str, const QColor &color)

{

HighlightingRule rule;

rule.pattern = QRegExp(str);

QTextCharFormat format;

format.setForeground(color);

rule.format = format;

highlightingRules.append(rule);

}

void markdown_highlighter::clearRules()

{

highlightingRules.clear();

}

然后在你需要高亮的地方即可

md_high = new markdown_highlighter(ui->textEdit);

md_high->SetColorText("##",Qt::green);