相关资料：
实例代码：
.pro
1 QT += core gui
2
3 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
4
5 CONFIG += c++11
6
7 # The following define makes your compiler emit warnings if you use
8 # any Qt feature that has been marked deprecated (the exact warnings
9 # depend on your compiler). Please consult the documentation of the
10 # deprecated API in order to know how to port your code away from it.
11 DEFINES += QT_DEPRECATED_WARNINGS
12
13 # You can also make your code fail to compile if it uses deprecated APIs.
14 # In order to do so, uncomment the following line.
15 # You can also select to disable deprecated APIs only up to a certain version of Qt.
16 #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0
17
18 SOURCES += \
19 main.cpp \
20 mainwindow.cpp
21
22 HEADERS += \
23 mainwindow.h
24
25 FORMS += \
26 mainwindow.ui
27
28 # Default rules for deployment.
29 qnx: target.path = /tmp/$${TARGET}/bin
30 else: unix:!android: target.path = /opt/$${TARGET}/bin
31 !isEmpty(target.path): INSTALLS += target
View Code
main.cpp
1 #include "mainwindow.h"
2
3 #include <QApplication>
4
5 int main(int argc, char *argv[])
6 {
7 QApplication a(argc, argv);
8 MainWindow w;
9 w.show();
10 return a.exec();
11 }
View Code
mainwindow.h
1 #ifndef MAINWINDOW_H
2 #define MAINWINDOW_H
3
4 #include <QMainWindow>
5
6 QT_BEGIN_NAMESPACE
7 namespace Ui { class MainWindow; }
8 QT_END_NAMESPACE
9
10 class MainWindow : public QMainWindow
11 {
12 Q_OBJECT
13
14 public:
15 MainWindow(QWidget *parent = nullptr);
16 ~MainWindow();
17
18 private slots:
19 void on_pushButton_clicked();
20
21 private:
22 Ui::MainWindow *ui;
23 };
24 #endif // MAINWINDOW_H
View Code
mainwindow.cpp
1 #include "mainwindow.h"
2 #include "ui_mainwindow.h"
3 #include <QDebug>
4 #include <QTextDocument>
5 #include <QTextBlock>
6
7 MainWindow::MainWindow(QWidget *parent)
8 : QMainWindow(parent)
9 , ui(new Ui::MainWindow)
10 {
11 ui->setupUi(this);
12
13 setWindowTitle(QStringLiteral("Qt使用QRegExp实现正则表达式处理"));
14
15 //
16 ui->textEdit->setText("GUID=100\n"
17 "AAA=98\n"
18 "tttt=99\n"
19 "iiii=88\n"
20 "sdfsdf=9888\n");
21 ui->textEdit_2->setText(".*=.*");
22 }
23
24 MainWindow::~MainWindow()
25 {
26 delete ui;
27 }
28
29
30 void MainWindow::on_pushButton_clicked()
31 {
32 QRegExp rx(ui->textEdit_2->toPlainText());
33
34 QTextDocument* doc = ui->textEdit->document () ; //文本对象
35 int cnt=doc->blockCount () ;//回车符是一个 block
36
37 ui->textEdit_3->clear();
38 for (int i=0; i<cnt; i++)
39 {
40 QTextBlock textLine = doc->findBlockByNumber(i) ; // 文本中的一段
41 QString str = textLine.text();
42 bool match = rx.exactMatch(str);
43 if (match)
44 ui->textEdit_3->append(str);
45 }
46 }
View Code
mainwindow.ui
1 <?xml version="1.0" encoding="UTF-8"?> 2 <ui version="4.0"> 3 <class>MainWindow</class> 4 <widget class="QMainWindow" name="MainWindow"> 5 <property name="geometry"> 6 <rect> 7 <x>0</x> 8 <y>0</y> 9 <width>629</width> 10 <height>488</height> 11 </rect> 12 </property> 13 <property name="windowTitle"> 14 <string>MainWindow</string> 15 </property> 16 <widget class="QWidget" name="centralwidget"> 17 <widget class="QPushButton" name="pushButton"> 18 <property name="geometry"> 19 <rect> 20 <x>510</x> 21 <y>260</y> 22 <width>81</width> 23 <height>71</height> 24 </rect> 25 </property> 26 <property name="text"> 27 <string>PushButton</string> 28 </property> 29 </widget> 30 <widget class="QLabel" name="label"> 31 <property name="geometry"> 32 <rect> 33 <x>10</x> 34 <y>0</y> 35 <width>54</width> 36 <height>12</height> 37 </rect> 38 </property> 39 <property name="text"> 40 <string>原始数据：</string> 41 </property> 42 </widget> 43 <widget class="QLabel" name="label_2"> 44 <property name="geometry"> 45 <rect> 46 <x>10</x> 47 <y>240</y> 48 <width>81</width> 49 <height>16</height> 50 </rect> 51 </property> 52 <property name="text"> 53 <string>正则表达式：</string> 54 </property> 55 </widget> 56 <widget class="QTextEdit" name="textEdit"> 57 <property name="geometry"> 58 <rect> 59 <x>10</x> 60 <y>20</y> 61 <width>481</width> 62 <height>211</height> 63 </rect> 64 </property> 65 <property name="readOnly"> 66 <bool>false</bool> 67 </property> 68 <property name="placeholderText"> 69 <string/> 70 </property> 71 </widget> 72 <widget class="QTextEdit" name="textEdit_2"> 73 <property name="geometry"> 74 <rect> 75 <x>10</x> 76 <y>260</y> 77 <width>481</width> 78 <height>81</height> 79 </rect> 80 </property> 81 </widget> 82 <widget class="QLabel" name="label_3"> 83 <property name="geometry"> 84 <rect> 85 <x>10</x> 86 <y>340</y> 87 <width>54</width> 88 <height>12</height> 89 </rect> 90 </property> 91 <property name="text"> 92 <string>结果：</string> 93 </property> 94 </widget> 95 <widget class="QTextEdit" name="textEdit_3"> 96 <property name="geometry"> 97 <rect> 98 <x>10</x> 99 <y>360</y> 100 <width>481</width> 101 <height>111</height> 102 </rect> 103 </property> 104 </widget> 105 </widget> 106 </widget> 107 <resources/> 108 <connections/> 109 </ui>View Code