Password validation using regExp

[dauuser]

hy @ all
I'm trying to implement a password validation using regExps, but as you can guess, it's not working.

The password must have the following properties:
8-16 digits long
must contain at least one lower case letter, one upper case letter and one digit.
here is my code:

TextInput{
     id: passwordInputBox;
     width: parent.width;
     echoMode: TextInput.Password;
     onTextChanged: { console.log(text) }
     validator: RexExpValidator { regExp: /^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,16}$/ }
}

now if I try to enter my password in the textInput, nothing happens. I can't write a single letter in it.
copy&paste of a correct password works, e g "aA139493a". but also just "aA1" works, despite the fact it's not 8 digits long. so after I copy three correct digits in my textInput, I am able to edit the rest of the password string up to 16 digits.
I can't explain this behavior, really need some help here.

thanks for any help.

[raven-worx]

@dauuser
Such a complex restriction wont be achievable with a regex

[dauuser]

uh okay. so I have to do this by using js, good to know. thank you!

[JosephMills]

@dauuser Here is something that I use to do just that I watch the TextInput and when the textChanges I hit this slot. In turn this handles the length and all that but also gives back a value of 0 --100 as to how strong it is. Could use some work but it works. full source code below.

void PasswordStrength::handelUpdate(const QString upString)
{
    if(upString.length() < 1 ){
        emit error(NotEnoughtCharacters);
        return;
    }
   
   // Set this to your liking 
    const double lengthFactor = m_reasonablePasswordLength / 8.0;
    int pwlength = (int) ( upString.length()/ lengthFactor);
    if (pwlength > 5) {
        pwlength = 5;
    }

    const QRegExp numRxp("[0-9]", Qt::CaseSensitive, QRegExp::RegExp);
    int numeric = (int) (upString.count(numRxp) / lengthFactor);
    if (numeric > 3) {
        numeric = 3;
    }

    const QRegExp symbRxp("\\W", Qt::CaseInsensitive, QRegExp::RegExp);
    int numsymbols = (int) (upString.count(symbRxp) / lengthFactor);
    if (numsymbols > 3) {
        numsymbols = 3;
    }

    const QRegExp upperRxp("[A-Z]", Qt::CaseSensitive, QRegExp::RegExp);
    int upper = (int) (upString.count(upperRxp) / lengthFactor);
    if (upper > 3) {
        upper = 3;
    }

    int pwstrength=((pwlength*10)-20) + (numeric*10) + (numsymbols*15) + (upper*10);


//    qDebug() << pwstrength;

    if ( pwstrength == 0 ) {
        setPwdStrength(0);
        setStrenghtString(pwstrength);

        return;
    }

    if ( pwstrength > 100 ) {
        setPwdStrength(100);
        setStrenghtString(pwstrength);

        return;
    }

    if (pwstrength > 1 && pwstrength < 99){
    setPwdStrength(pwstrength);
    setStrenghtString(pwstrength);

    }
}

sources file

header

[dauuser]

@JosephMills thank you for sharing your code, but I found a faster solution for my project:

I just created a js function in my TextInput, which changes for testing the color of my box. Works fine.

function validation(text){
                var regExp = /^(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,16}$/;
                if(regExp.test(text)) passwordInputBox.color = "#62aa46";
                else passwordInputBox.color = "red";
            }

            onTextChanged: {
                validation(text);
            }