5.12 RegExpr Unicode Support

rhb327

Does Qt 5.12 support the following?

objRegExp =/^[\p{L}\p{N}-]{3,30}$/u
return objRegExp.test(inputString)

I can get this to work fine on https://regex101.com/ but I'm concerned ECMAScript versions might not be high enough in 5.12 for /p{...} support. If not, can someone describe a good method to localize a [a-zA-Z0-9] type regular expression?

Thanks,
-Rich

JonB

@rhb327
I don't know the answer. But I recently discovered Qt comes with interactive QRegularExpression UI checker sample code at https://doc.qt.io/qt-5/qtwidgets-tools-regularexpression-example.html. Takes one minute to download & compile, useful from then onward for whatever version of Qt you are using.

rhb327

Thanks! Link was helpful. I decided to move away from QML and I created a C++ support class kinda like this:

    qmlRegisterType<RegEx_Qml>("REQML", 1, 0, "RegEx_Qml");
    RegEx_Qml* reQML = new RegEx_Qml();
    engine->rootContext()->setContextProperty("reQML", reQML);

#ifndef REGEX_QML_H
#define REGEX_QML_H
#include <QObject>
#include <QRegularExpression>
#include "constants.h"

class RegEx_Qml : public QObject {
    Q_OBJECT
    Q_PROPERTY(QString valString READ valString WRITE setValString NOTIFY valStringChanged);

public:
    explicit RegEx_Qml(QObject* parent = nullptr);
    ~RegEx_Qml();
    Q_INVOKABLE bool test(QString tst_str);

signals:
    void valStringChanged(QString valString);

private:
    QString valString() const { return m_valString; }
    void setValString(QString s) {
        m_valString = s;
        emit valStringChanged(m_valString);
    }

    QString m_valString;
    QRegularExpression regExp;
};
#endif // REGEX_QML_H


RegEx_Qml::RegEx_Qml(QObject* parent) : QObject(parent) {
    regExp.setPatternOptions(QRegularExpression::UseUnicodePropertiesOption);
    setValString("");
}

RegEx_Qml::~RegEx_Qml() {
}

bool RegEx_Qml::test(QString tst_str) {
    regExp.setPattern(m_valString);
    QRegularExpressionMatch mtch = regExp.match(tst_str, 0);

#ifdef VERBOSITY_HIGH
    qDebug() << "RegEx: " << tst_str << m_valString << regExp.match(tst_str, 0) << mtch.isValid() << mtch.hasMatch();
#endif

    if(mtch.isValid()) {
        return mtch.hasMatch();
    }
    else {
        return false;
    }
}

QML Interface

                RegEx_Qml {
                    id: regExQml
                }

                // validate Text fields with respect to strIndex
                function validateInputData(inputIndex, inputString){

                    var objRegExp
                    switch(inputIndex) {
                    case 0 :
                        regExQml.valString = "^[\\w\\d.-]{4,20}$"
                        return regExQml.test(inputString)
                    case 1 :
                        console.log("Validating inputs for Pwd: ", usermodel_AddUser.get(0).labelText,usermodel_AddUser.count)
                        if(usermodel_AddUser.get(0).labelText==="Test" || usermodel_AddUser.get(0).labelText==="service"){
                            regExQml.valString = "^[\\w\\d.-]{4,20}$"
                            return regExQml.test(inputString)
                        }