Qt-Qt使用QRegExp实现正则表达式处理(Qt5.14.2+win10)

相关资料：

实例代码：

.pro

QT       += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    mainwindow.cpp

HEADERS += \
    mainwindow.h

FORMS += \
    mainwindow.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

main.cpp

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>

QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void on_pushButton_clicked();

private:
    Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
#include <QTextDocument>
#include <QTextBlock>

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    setWindowTitle(QStringLiteral("Qt使用QRegExp实现正则表达式处理"));

    //
    ui->textEdit->setText("GUID=100\n"
                          "AAA=98\n"
                          "tttt=99\n"
                          "iiii=88\n"
                          "sdfsdf=9888\n");
    ui->textEdit_2->setText(".*=.*");
}

MainWindow::~MainWindow()
{
    delete ui;
}


void MainWindow::on_pushButton_clicked()
{
    QRegExp rx(ui->textEdit_2->toPlainText());

    QTextDocument* doc = ui->textEdit->document () ; //文本对象
    int cnt=doc->blockCount () ;//回车符是一个 block

    ui->textEdit_3->clear();
    for (int i=0; i<cnt; i++)
    {
        QTextBlock textLine = doc->findBlockByNumber(i) ; // 文本中的一段
        QString str = textLine.text();
        bool match = rx.exactMatch(str);
        if (match)
          ui->textEdit_3->append(str);
    }
}

mainwindow.ui

<?xml version="1.0" encoding="UTF-8"?>
<ui version="4.0">
 <class>MainWindow</class>
 <widget class="QMainWindow" name="MainWindow">
  <property name="geometry">
   <rect>
    <x>0</x>
    <y>0</y>
    <width>629</width>
    <height>488</height>
   </rect>
  </property>
  <property name="windowTitle">
   <string>MainWindow</string>
  </property>
  <widget class="QWidget" name="centralwidget">
   <widget class="QPushButton" name="pushButton">
    <property name="geometry">
     <rect>
      <x>510</x>
      <y>260</y>
      <width>81</width>
      <height>71</height>
     </rect>
    </property>
    <property name="text">
     <string>PushButton</string>
    </property>
   </widget>
   <widget class="QLabel" name="label">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>0</y>
      <width>54</width>
      <height>12</height>
     </rect>
    </property>
    <property name="text">
     <string>原始数据：</string>
    </property>
   </widget>
   <widget class="QLabel" name="label_2">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>240</y>
      <width>81</width>
      <height>16</height>
     </rect>
    </property>
    <property name="text">
     <string>正则表达式：</string>
    </property>
   </widget>
   <widget class="QTextEdit" name="textEdit">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>20</y>
      <width>481</width>
      <height>211</height>
     </rect>
    </property>
    <property name="readOnly">
     <bool>false</bool>
    </property>
    <property name="placeholderText">
     <string/>
    </property>
   </widget>
   <widget class="QTextEdit" name="textEdit_2">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>260</y>
      <width>481</width>
      <height>81</height>
     </rect>
    </property>
   </widget>
   <widget class="QLabel" name="label_3">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>340</y>
      <width>54</width>
      <height>12</height>
     </rect>
    </property>
    <property name="text">
     <string>结果：</string>
    </property>
   </widget>
   <widget class="QTextEdit" name="textEdit_3">
    <property name="geometry">
     <rect>
      <x>10</x>
      <y>360</y>
      <width>481</width>
      <height>111</height>
     </rect>
    </property>
   </widget>
  </widget>
 </widget>
 <resources/>
 <connections/>
</ui>