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Trying to use QregularExpression

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  • L Offline
    L Offline
    leinad
    wrote on last edited by Chris Kawa
    #1

    Hi,

    I migrated to Qt 6.2.4 and now found that QRegExp has been deprecated and we should now use QRegularExpression.

    I have code using QRegExp which worked fine but when I try to replace it with a QRegularExpression it does not return the correct results. In otherwords not all the IPs are returned

    I have a QString which contains multiple IPs and I would like to extract all the IPs from the string. Some may repeat and some may not.

    This code works fine using QRegExp:

    QRegExp rx("(((?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))");
    QStringList initialList ;
        while ((pos = rx.indexIn(msg, pos)) != -1)
        {
            initialList << rx.cap(1); 
            pos += rx.matchedLength();
        } 
    

    When I try to do the following using QRegularExpression it does not return all the IP's.

    static QRegularExpression ipRX("(((?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))");
    QRegularExpressionMatch match = ipRX.match(msg);
    QStringList initialList ;
        if(match.hasMatch())
        {
            initialList << match.capturedTexts();
            initialList.removeDuplicates();
        }
    

    Any ideas what I'm doing wrong?

    Thanks.

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    • Chris KawaC Offline
      Chris KawaC Offline
      Chris Kawa
      Lifetime Qt Champion
      wrote on last edited by Chris Kawa
      #2

      QRegularExpression::match only looks for the first match. capturedTexts() returns the capture groups in that single match.

      A code equivalent to the QRegExp one would be something like this:

      QRegularExpressionMatchIterator i = ipRX.globalMatch(msg);
      while(i.hasNext())
      {
          initialList << i.next().captured(1);
      }
      
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      • L Offline
        L Offline
        leinad
        wrote on last edited by
        #3

        Great! Thanks so much.

        1 Reply Last reply
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