QRegularExpressionValidator: am I missing something?!

  • Hi,

    I am trying to validate (using QRegularExpressionValidator) a URL. It got the regular expression from https://gist.github.com/dperini/729294 and, from what I can tell, it looks good (and it certainly seems to work when I tried using some online regular expression testers). However, my tests using Qt are anything but conclusive. So, could it be that I wrongly 'converted' the regular expression to C++?

    Otherwise, worse is the fact that if I try to enter something like http://uuuuuuuuuuuuuuuuuuuu, then my test application kind of hangs up. In fact, if I run it in debug mode and pause it, I can see that QRegularExpressionValidator::validate() makes an indirect call to pcre16_exec, which itself makes call to match, which itself makes call to match, which itself makes call to match, etc. Could this be a bug in QRegularExpressionValidator or even pcre16_exec?


    @QT += core gui

    greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

    TARGET = QRegularExpressionValidatorTest
    TEMPLATE = app

    SOURCES += main.cpp@


    @#include <QApplication>
    #include <QDesktopWidget>
    #include <QDialog>
    #include <QLineEdit>
    #include <QRegularExpressionValidator>
    #include <QVBoxLayout>

    int main(int pArgC, char *pArgV[])
    QApplication application(pArgC, pArgV);

    QDialog *dialog = new QDialog();
    QVBoxLayout *dialogLayout = new QVBoxLayout(dialog);
    dialog->setWindowTitle("URL Tester");
    // We want to validate a URL, the regular expression of which comes from
    //     https://gist.github.com/dperini/729294
    // It is released under the MIT license and is therefore fine for us to use
    QString urlRegExp = QString() +
                        // protocol identifier
                        "(?:(?:https?|ftp)://)" +
                        // user:pass authentication
                        "(?:\\S+(?::\\S*)?&#64;)?" +
                        "(?:" +
                          // IP address exclusion
                          // private & local networks
                          "(?!(?:10|127)(?:\\.\\d{1,3}){3})" +
                          "(?!(?:169\\.254|192\\.168)(?:\\.\\d{1,3}){2})" +
                          "(?!172\\.(?:1[6-9]|2\\d|3[0-1])(?:\\.\\d{1,3}){2})" +
                          // IP address dotted notation octets
                          // excludes loopback network
                          // excludes reserved space >=
                          // excludes network & broacast addresses
                          // (first & last IP address of each class)
                          "(?:[1-9]\\d?|1\\d\\d|2[01]\\d|22[0-3])" +
                          "(?:\\.(?:1?\\d{1,2}|2[0-4]\\d|25[0-5])){2}" +
                          "(?:\\.(?:[1-9]\\d?|1\\d\\d|2[0-4]\\d|25[0-4]))" +
                        "|" +
                          // host name
                          "(?:(?:[a-z\\x{00a1}-\\x{ffff}0-9]+-?)*[a-z\\x{00a1}-\\x{ffff}0-9]+)" +
                          // domain name
                          "(?:\\.(?:[a-z\\x{00a1}-\\x{ffff}0-9]+-?)*[a-z\\x{00a1}-\\x{ffff}0-9]+)*" +
                          // TLD identifier
                          "(?:\\.(?:[a-z\\x{00a1}-\\x{ffff}]{2,}))" +
                        ")" +
                        // port number
                        "(?::\\d{2,5})?" +
                        // resource path
                        "(?:/[^\\s]*)?" +
    QLineEdit *dialogValue = new QLineEdit(dialog);
    dialogValue->setValidator(new QRegularExpressionValidator(QRegular[removed]urlRegExp, QRegularExpression::CaseInsensitiveOption), dialog));
    return application.exec&#40;&#41;;


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