RegEX Validator


I tried to make a RegEx Validtaor for a LineEdit in QT. I use currently:

    mDiskCustomPattern = new QLineEdit(ConfigurationPage::mSettings.value("CustomDiskNamePattern", tr("%S-%D-%C")).toString(), this);
    QRegExp regx("^(?!.*(.)\\1)%[%SCD-]*$");
    QValidator *validator = new QRegExpValidator(regx, mDiskCustomPattern);
    mDiskCustomPattern->setValidator( validator );

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This Validator allows on %D, %C, %S  and - values. It is not possible to make %% or %SS or any other character. Now I want to limit it to allow ony one time %S and one time %D and one time %C at the same time. So the max, string is %S-%D-%C not more . Any idea how to solve this?
Ingo FoersterProgrammerAsked:
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regular expressions are mighty tools but could make a simple thing rather complicate.

why not doing it straight forward like

State FormatValidator::validate(QString & input, int & pos)
     str = input;
     QString ps = "%S";
     QString pd = "%D";
     QString pc = "%C";
     if ((pos = str.lastIndexOf(ps)) != str.indexOf(ps))
           return QValidator::Invalid;
     if ((pos = str.lastIndexOf(pd)) != str.indexOf(pd))
     return QValidator::Invalid;
     if ((pos = str.lastIndexOf(pc)) != str.indexOf(pc))
          return QValidator::Invalid;     
     QString strdash(str.length(), QChar('-'));
     if (strdash != str)
         pos = -1;
         return QValidator::Invalid;
     return QValidator::Acceptable;

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