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QLineEdit using a QRegExpValidator doesn't take effect.

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qlineeditqregexpvalidatoqregexp
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  • C Offline
    C Offline
    Cysis145
    wrote on last edited by SGaist
    #1

    Hi guys i'm trying to get my LineEdit to only take in letters and numbers. I've set up a QRegExpValidator and applied it to the lineedit however it doesn't appear to be working

    heres my code:

        QRegExp rx("[A-Za-z0-9]");
        QRegExpValidator *v = new QRegExpValidator(rx, this);
        ui->LE_ObjectName->setValidator(v);
    

    Even with this the LineEdit just takes in any character. Not really sure what im doing wrong here

    Thanks!

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    • SGaistS Offline
      SGaistS Offline
      SGaist
      Lifetime Qt Champion
      wrote on last edited by
      #2

      Hi,

      Your current regex only allows one char at a time in the QLineEdit.

      Note that if you are using Qt 5,, you should move to QRegularExpression, its the replacement of the deprecated QRegExp

      Interested in AI ? www.idiap.ch
      Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

      C 1 Reply Last reply
      1
      • SGaistS SGaist

        Hi,

        Your current regex only allows one char at a time in the QLineEdit.

        Note that if you are using Qt 5,, you should move to QRegularExpression, its the replacement of the deprecated QRegExp

        C Offline
        C Offline
        Cysis145
        wrote on last edited by Cysis145
        #3

        @SGaist I am using QT5 but after looking into QRegularExpression docs i dont see how i can apply it in this scenario.

        Also what do you mean by only allows one char at a time?

        I'm trying to get my LineEdit to accept only number and letter characters but without limiting the total number of characters in the LineEdit. At the moment it's taking in all the characters which i don't want (so no [,.#+- etc. symbols) Please Expand

        Thanks

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        • C Offline
          C Offline
          Cysis145
          wrote on last edited by
          #4

          Ah never mind i figured it out!

          Thanks for all your help, all i needed to do was change the QRegExp line to:

           QRegExp rx("[A-Za-z0-9]+");
          
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          • VRoninV Offline
            VRoninV Offline
            VRonin
            wrote on last edited by VRonin
            #5
            QRegularExpression rx("[A-Za-z0-9]*");
                QRegularExpressionalidator *v = new QRegularExpressionValidator(rx, this);
                ui->LE_ObjectName->setValidator(v);
            

            "La mort n'est rien, mais vivre vaincu et sans gloire, c'est mourir tous les jours"
            ~Napoleon Bonaparte

            On a crusade to banish setIndexWidget() from the holy land of Qt

            1 Reply Last reply
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