Question

我有QRegExp的问题。这是我的来源。我想要＆＃34; Re：＆＃34;和＆＃34; Fwd：＆＃34;要删除的子字符串：

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QRegExp>
#include <iostream>

using namespace std;

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

    QString s = "Fwd: Re: my subject line";
    cout << "original string: " << s.toLatin1().data() << endl;

    QRegExp rx("\\b(Re:|Fwd:)\\b");
    rx.setCaseSensitivity(Qt::CaseInsensitive);

    s.replace(rx,"");
    cout << "replaced string: " << s.toLatin1().data() << endl;

}

它不起作用。输出：

original string: Fwd: Re: my subject line
replaced string: Fwd: Re: my subject line

如果我删除＆＃34;：＆＃34; regexp中的char，substring＆＃34; Re＆＃34;和＆＃34; Fwd＆＃34;将被删除，但＆＃34;：＆＃34; char留在文本中。

如何设置regexp表达式以删除＆＃34; Re：＆＃34;和＆＃34; Fwd：＆＃34;来自文本的子串？

问候。

Answer 1

QRegExp rx("\\b(Re:|Fwd:)\\b");

\ b仅适用于\ w类型（如果我错了，请纠正我），所以你实际上可以写

QRegExp rx("\\b(Re:|Fwd:)");

或

QRegExp rx("(Re:|Fwd:)");

Answer 2

I've found a solution.

QString s = "Fwd: Re: Re: my subject: line";
cout << "original string: " << s.toLatin1().data() << endl;

QRegExp rx("\\b(Re|Fwd)\\b[:]");
rx.setCaseSensitivity(Qt::CaseInsensitive);

s.replace(rx,"");
s = s.trimmed();
cout << "replaced string: " << s.toLatin1().data() << endl;

and the output is:

original string: Fwd: Re: Re: my subject: line
replaced string: my subject: line

Someone have a better way?

Regards

字符串后的QRegExp和冒号（:)

2 个答案: