How to make lineEdit only accept string?

[tjktak1002]

Hello everyone,
I have been trying to make my line edits only accept alphabet characters(no numbers, no special characters) using QRegularExpression but I have not been succeed so far.
This is my code:

QRegularExpression re("[A-Z][a-z]");
QRegularExpressionValidator v(re, this);
ui->lineEditFirstName->setValidator(&v);
ui->lineEditLastName->setValidator(&v);

But somehow I can still type numbers and special characters in my line edit which is not what I want.
Thank you for reading and have a good day!

[jsulm]

@tjktak1002 said in How to make lineEdit only accept string?:

QRegularExpressionValidator v(re, this);

Your validator is a local variable and is destroyed as soon as it gets out of scope...

[tjktak1002]

ok one solution to my problem that I have found (allow all alphabet characters and whitespace)

QRegularExpressionValidator* v = new QRegularExpressionValidator(QRegularExpression(R"(^[a-zA-Z- ]*)"));
    ui->lineEditFirstName->setValidator(v);
    ui->lineEditLastName->setValidator(v);

[Christian Ehrlicher]

@tjktak1002 said in How to make lineEdit only accept string?:

all alphabet characters

My alphabet has umlauts... -> \w

[tjktak1002]

@Christian-Ehrlicher said in How to make lineEdit only accept string?:

umlauts.

hey this one works for my french keyboard so maybe it can help you a bit

QRegularExpressionValidator* v = new QRegularExpressionValidator(QRegularExpression(R"(^[a-zA-ZÀ-ÿ-. ]*$)"));

[Christian Ehrlicher]

@tjktak1002 said in How to make lineEdit only accept string?:

hey this one works for my french keyboard so maybe it can help you a bit

I know what to do - I just wanted to tell you that your regex doesn't accept all characters but only a few.

[tjktak1002]

@Christian-Ehrlicher oh ok haha :D Thanks for reminding me tho