Qt 正则表达式检测密码格式

关键词：Qt 正则表达式 QRegExp QMessageBox

1、建立Qt Application工程，设计UI[一个输入框，一个按钮]；

2、Widget.h文件：

@H_403_29@@H_403_29@@H_403_29@@H_403_29@@H_403_29@@H_403_29@@H_403_29@@H_403_29@ @H_403_29@#ifndefWIDGET_H

 #define WIDGET_H

 #include <QWidget>

 #include <QRegExp>

 #include <QMessageBox>

 namespace Ui {

 @H_403_29@ @H_403_29@ @H_403_29@ class Widget;

 class Widget : public QWidget

 @H_403_29@ @H_403_29@@H_403_29@ Q_OBJECT

@H_403_29@ @H_403_29@@H_403_29@ public:

 @H_403_29@ @H_403_29@ @H_403_29@explicit Widget(QWidget *parent = 0);

 @H_403_29@ @H_403_29@ ~Widget();

@H_403_29@ @H_403_29@private:

 @H_403_29@ @H_403_29@ @H_403_29@ Ui::Widget *ui;

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@QRegExp rx;

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@QMessageBox msgBox;

@H_403_29@ @H_403_29@private:

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@void init(); //初始化函数

@H_403_29@ @H_403_29@private slots:

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@void checkPwd();

@H_403_29@};

 #endif // WIDGET_H

3、Widget.cpp

@H_403_29@ @H_403_29@ #include "widget.h"

@H_403_29@ @H_403_29@ #include "ui_widget.h"

@H_403_29@ @H_403_29@ Widget::Widget(QWidget *parent) :

 @H_403_29@ @H_403_29@ QWidget(parent),

 @H_403_29@ @H_403_29@ui(new Ui::Widget)

@H_403_29@ @H_403_29@{

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ ui->setupUi(this);

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@this->init();

@H_403_29@ @H_403_29@}

@H_403_29@ @H_403_29@Widget::~Widget()

@H_403_29@ @H_403_29@{

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ delete ui;

@H_403_29@ @H_403_29@}

@H_403_29@ @H_403_29@ void Widget::init()

@H_403_29@ @H_403_29@{

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ //建立信号和响应函数

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@connect(ui->pushButton,SIGNAL(clicked()),SLOT(checkPwd()));

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@rx.setPatternSyntax(QRegExp::RegExp);

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@//对大小写字母敏感，即区分大小写

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@rx.setCaseSensitivity(Qt::CaseSensitive);

 @H_403_29@ @H_403_29@ @H_403_29@ //匹配格式为所有大小写字母和数字组成的字符串，位数不限

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@rx.setPattern(QString("^[A-Za-z0-9]+$"));

@H_403_29@ }

@H_403_29@ @H_403_29@void Widget::checkPwd()

@H_403_29@ @H_403_29@{

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@QString pwd = ui->lineEdit->text();

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@if(pwd.isEmpty())  //检测密码输入框是不是为空

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@{

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ui->label2->setText("Password cant be empty!");

 @H_403_29@ @H_403_29@ @H_403_29@@H_403_29@ @H_403_29@ ui->label2->setStyleSheet("color: rgb(255, 78, 25);");;

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@}

 @H_403_29@ @H_403_29@ @H_403_29@ else

 @H_403_29@ @H_403_29@ @H_403_29@{

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ui->label2->setText("");

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@if(rx.exactMatch(pwd))

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@{@H_403_29@

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@msgBox.setText("The password format is Right");

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@msgBox.exec();

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@}

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@else

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ {

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ msgBox.setText("Sorry,The password format is wrong!!\n

@H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ \nPlease reenter your password.");

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ msgBox.exec();

 @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ @H_403_29@ }

 @H_403_29@ @H_403_29@ @H_403_29@}

@H_403_29@ @H_403_29@}

@H_403_29@4、main.cpp不用修改。

5、运行结果如下：

@H_403_29@ @H_403_29@当输入特殊字符时会提示错误：

//------------------------------ THE END -----------------------------

Qt 正则表达式检测密码格式

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