Qt正则表达式提取数据

void testRegexCapture()
{
    QString pattern(“(.*)=(.*)”);
    QRegExp rx(pattern);

    QString str(“a=100″);
    int pos = str.indexOf(rx);              // 0, position of the first match.
                                            // Returns -1 if str is not found.
                                            // You can also use rx.indexIn(str);
    qDebug() << pos;
    if ( pos >= 0 )
    {
        qDebug() << rx.matchedLength();     // 5, length of the last matched string
                                            // or -1 if there was no match
        qDebug() << rx.capturedTexts();     // QStringList(“a=100″, ”a”, ”100″),
                                            //   0: text matching pattern
                                            //   1: text captured by the 1st ()
                                            //   2: text captured by the 2nd ()

        qDebug() << rx.cap(0);              // a=100, text matching pattern
        qDebug() << rx.cap(1);              // a, text captured by the nth ()
        qDebug() << rx.cap(2);              // 100,

        qDebug() << rx.pos(0);              // 0, position of the nth captured text
        qDebug() << rx.pos(1);              // 0
        qDebug() << rx.pos(2);              // 2
    }
}

QString s = ”a=100″;
s.replace(QRegExp(“(.*)=”), ”b=”);
qDebug() << s;                          // b=100

QString s = ”a=100″;
s.replace(QRegExp(“(.*)=(.*)”), ”\\1\\2=\\2″);  // \1 is rx.cap(1), \2 is rx.cap(2)
qDebug() << s;                                  // a100=100

void testRegexMatch()
{
    QString pattern(“.*=.*”);
    QRegExp rx(pattern);

    bool match = rx.exactMatch(“a=3″);
    qDebug() << match;                      // True

    match = rx.exactMatch(“a/2″);
    qDebug() << match;                      // False
}