qregexpvalidator qlineedit email address
To validate an email address using QRegExpValidator in C++, you can follow these steps:
Step 1: Include the necessary header files Include the necessary header files for using QRegExpValidator and QLineEdit in your C++ code:
#include <QRegExpValidator>
#include <QLineEdit>
Step 2: Create a QLineEdit widget Create a QLineEdit widget to accept the user input for the email address:
QLineEdit *emailLineEdit = new QLineEdit(this);
Step 3: Create a QRegExpValidator Create a QRegExpValidator object to validate the email address using a regular expression pattern:
QRegExpValidator *emailValidator = new QRegExpValidator(this);
Step 4: Set the regular expression pattern Set the regular expression pattern for the email address validation:
QRegExp emailPattern("^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}$");
emailValidator->setRegExp(emailPattern);
Step 5: Set the validator for the QLineEdit widget Set the QRegExpValidator object as the validator for the QLineEdit widget:
emailLineEdit->setValidator(emailValidator);
Step 6: Use the QLineEdit widget Use the QLineEdit widget to get user input for the email address and validate it:
QString email = emailLineEdit->text();
if (emailValidator->validate(email, 0) == QValidator::Acceptable) {
// Email address is valid
} else {
// Email address is invalid
}
These steps will allow you to validate an email address using QRegExpValidator and QLineEdit in C++.