Question

I want use regex to find something in string (or QString) that is between ” (quotes).

My simple String: x=”20.51167″ and I want 20.51167.

Is it possible with Regular Expressions ??

On start I had somthing like this string :

<S id="1109" s5="1" nr="1183" n="Some text" test=" " x="20.53843" y="50.84443">

Using regexp like: (nr=\"[0-9]+\") (y=\"[0-9 .^\"]+\")" etc I get my simple string like x=”20.51167″. Maybe this is wrong way and I can get value that is between quotes at one time ??

Answer 1

For your particular example, this will work:

#include <QRegExp>
#include <QString>
#include <iostream>
int main()
{
    //Here's your regexp.
    QRegExp re("\"[^\"^=]+\"");
    //Here's your sample string:
    QString test ="<S id=\"1109\" s5=\"1\" nr=\"1183\" n=\"Some text\" test=\" \" x=\"20.53843\" y=\"50.84443\">";
    int offset = 0;
    while( offset = re.indexIn( test, offset + 1 ) )
    {
        if(offset == -1)
            break;
        QString res = re.cap().replace("\"", "");
        bool ok;
        int iRes;
        float fRes;
        if( res.toInt( &ok ) && ok )
        {
            iRes = res.toInt();
            std::cout << "int: " << iRes << std::endl;
        }
        else if ( res.toFloat( &ok ) && ok )
        {
            fRes = res.toFloat();
            std::cout << "float: " << fRes << std::endl;
        }
        else
            std::cout << "string: " << res.toStdString() << std::endl;
    }
}

The output will be;

int: 1109
int: 1
int: 1183
string: Some text
string:  
float: 20.5384
float: 50.8444