#include <QRegularExpression>
#include <QFile>
#include <QIODevice>
#include <QTextStream>
#include <stdio.h>


int main()
{
    QString exp1(".*.*aa");
    QString exp2(".*.*ma");

    QString filename("C:\\workspace\\file.txt");
    QFile file(filename);

    file.open(QFile::ReadOnly);
    QTextStream in(&file);
    QString content = in.readAll();
    file.close();

    static QRegularExpression regex(exp1);
    bool isValid1 = regex.isValid();
    QRegularExpressionMatch regmatch = regex.match(content);
    bool isValid2 = regmatch.isValid();
    printf("\n%s\n", exp1.toStdString().c_str());
    printf("\n 1: %s \n 2: %s \n", isValid1 ? "true" : "false", isValid2 ? "true" : "false");

    regex.setPattern(exp2);
    isValid1 = regex.isValid();
    regmatch = regex.match(content);
    isValid2 = regmatch.isValid();
    printf("\n%s\n", exp2.toStdString().c_str());
    printf("\n 1: %s \n 2: %s \n", isValid1 ? "true" : "false", isValid2 ? "true" : "false");

    return 0;
}