QT Regular Expressions---for IP addresses

To determine the QT regular expression of a legitimate IP:

BOOL isipaddress (QString IP)

{

Qregexp rx2 ("(//d+) (//.) (//d+) (//.) (//d+) (//.) (//d +) ");

int pos = rx2.indexin (IP);

if (pos>-1)
{

for (int i=0;i<4;i++)
{
if (Rx2.cap (i*2+1). ToInt () >=255)
{
Qmessagebox::information (This, tr ("error"), TR ("IP address Error"));

return false;

}
}

if (Rx2.cap (7). ToInt () ==0)
{

Qmessagebox::information (This, tr ("error"), TR ("IP address Error"));

return false;

}

if (Rx2.cap (7). ToInt () ==0)
{
Qmessagebox::information (This, tr ("error"), TR ("IP address Error"));

return false;

}
}
Else
{

Qmessagebox::information (This, tr ("error"), TR ("IP address Error"));

return false;

}

return true;

}

An easier way to determine an IP address is to:

Qregexp rx2 ("^ ([1]?/d/d?| 2[0-4]/D|25[0-5])/. ([1]?/d/d?| 2[0-4]/D|25[0-5])/. ([1]?/d/d?| 2[0-4]/D|25[0-5])/. ([1]?/d/d?| 2[0-4]/D|25[0-5]) $ ")

if (!rx2.exactmatch (IP))

{

Qmessagebox::information (This, tr ("error"), TR ("IP address Error"));

return false;

}

return true;

Determine if the file name contains characters other than letters, numbers, and underscores:

BOOL Isrightfilename (QString filename)

{

Qregexp Rx ("[a-za-z_0-9]+");

if (!rx.exactmatch (filename))

{

Qmessagebox::information (This, tr ("error"), tr ("file name contains other characters or Chinese characters");

return false;

}

return true;

}

use regular expressions to verify the legality of the IP. Transferred from: http://yleesun.blog.163.com/blog/static/29413402200952464324323/

Regular Expressions:

Qregexp Rx (2[0-4]//d|25[0-5]|[ 01]?//d//d?) //.) {3} (2[0-4]//d|25[0-4]| [01]?//d//d?] ;

Iplabel = new Qlabel (tr ("IP Address:"));
Iplineedit = new Qlineedit;
Iplabel->setbuddy (Iplineedit);

Qvalidator *validator = new Qregexpvalidator (rx, this);
Iplineedit->setvalidator (validator);
Iplineedit->setinputmask ("000.000.000.000;"); the implementation of the framework of verify the legitimacy of the input IP, subnet mask. (Generate IP Address Class) from: Http://www.qtcn.org/bbs/simple/?t18020.html//ip.h
#include <qwidget.h>
#include <qstring.h>
#include <qlineedit.h>
#include <qvalidator.h>

#define Ip_h

Class Ip:public Qwidget
{
Public
IP (const QString & text, Qwidget *parent, const char *name);
QString GetValue ();
Private
Qlineedit * Ip[4];
Qintvalidator * Ipv[4];
};

Ip.cpp
#include <qwidget.h>
#include <qlabel.h>
#include <qfont.h>
#include <qhbox.h>
#include <qlineedit.h>

#include "Ip.h"

Ip::ip (const QString & text, Qwidget *parent, const char *nombre): qwidget (parent, nombre, 0)
{
Qfont *fuente = new Qfont ("Arial", +, qfont::normal);
Fuente->setpixelsize (14);
Qlabel *label = new Qlabel (this);
Label->setfont (* fuente);
Label->setminimumwidth (140);
Label->setmaximumwidth (140);
Qhbox * IPP = new Qhbox ((qwidget*) this);
Ipp->setminimumwidth (140);
Ipp->setmaximumwidth (140);
for (int i=0; i<4; i++)
{
ip = new Qlineedit ((qwidget*) IPP, Nombre);
Ip->setfont (* fuente);
Ip->setminimumwidth (30);
Ip->setmaxlength (3);
IPV = new Qintvalidator (0, 255, (qobject*) IPP);
Ip->setvalidator (IPV);
}

Label->move (0, 0);
Ipp->move (150, 0);
Label->settext (text);
Ip->setinputmask ("000.000.000.000;");
}

QString Ip::getvalue ()
{
BOOL flag = FALSE;
for (int i=0; i<4; i++)
if (Ip->text (). IsEmpty ())
Flag = true;
if (flag)
Return QString ("0.0.0.0");
Else
Return QString (Ip[0]->text () + "." + ip[1]->text () + "." + ip[2]->text () + "." +
Ip[3]->text ());
} Sets the input box mode with an IP input format. Turn from: Http://www.qtcn.org/bbs/simple/?t28473.htmlQRegExp Rx ("(2[0-4]//d|25[0-5]|[ 01]?//d//d?) //.) {3} (2[0-4]//d|25[0-5]| [01]?//d//d?)];
Qregexpvalidator V (RX, 0);
Qlineedit le;
Le.setvalidator (&AMP;V);
Le.setinputmask ("000.000.000.000;0");//Just add it; 0 guaranteed to have a default value allows the regular and mask to take effect simultaneously.

QT Regular Expressions---for IP addresses