How to have atleast more than four digits/Characters

StarRocks

Dear Forums,

                     I am new to Qt....I have a doubt how can i allow more than four digits/Character in a QLineEdit i have done in restricting the number of characters/digits by using *setMaxlength()* but im not knowing about the issue i have raised.......Please provide me with an solution.........

Regards,

goblincoding

If I understand you correctly, you may want to consider using regular expressions and "QRegExp":https://qt-project.org/doc/qt-4.8/qregexp.html

StarRocks

Dear goblincoding,

                       Thanks for the reply.......Actually i have gone through those but dint find any solution.can you give me any syntax......Any solution would be appreciable.........Thanks in Advance.........

Regards,

goblincoding

I believe the following regex should do what you want (allow a minimum of 4 word characters to be entered into your line edit):

\w{4,}

An example of how you can put it all together

@
QRegExp regex("\w{4,}"); //escape the ""
QRegExpValidator *validator = new QRegExpValidator(regex, this);
yourLineEdit->setValidator(validator);
@

Please test this to make sure it does what you want.

(a useful site for testing regular expressions is "Rubular":http://rubular.com/)

StarRocks

Dear goblincoding,

                            Thanks for the reply…….Actually i want this validation in the button i.e when i click the insert/submit button this action should be performed……Any solution would be appreciable………Thanks in Advance………

Regards,

goblincoding

You will need to start studying Qt if you are planning on using the framework, there simply is no other way.

I suggest you start by reading "how to Learn Qt":https://qt-project.org/doc/qt-4.8/how-to-learn-qt.html

Pay close attention to the "Meta-Object System":https://qt-project.org/doc/qt-4.8/metaobjects.html and "Signals and Slots":https://qt-project.org/doc/qt-4.8/signalsandslots.html#signals-and-slots

Remember that the "Qt Documentation":https://qt-project.org/doc/ is your friend :)

Good luck!

StarRocks

Dear goblincoding,

                          Thanks for the reply..........I got the solution for the above query i have asked for and i have written the code in the button event as if(objectnameofthefield.length()<4) and it worked for me...Thanks in advance..........Hope this is the right way i have worked i guess.......Any solution would be appreciable......

Regards,