[Qt-interest] Problem with RegExp extraction value from Json kind of response

[Christopher Probst]

Hello Meir

Using the regexp tester provided by Qt in

$QTDIR/examples/tools/regexp

the following works for me:

#include <QDebug>
#include <QRegExp>

int main(int argc, char *argv[])
{

     QString http_response = "{\"key\":\"a99fdd865c2-10000\",\"oid\": 
1000055,\"expires\":0000,\"secret\":\"509c03edfdc7\",\"sign\": 
\"f0dd9e5226d0e77\"}";

     QRegExp rx("\"key\":\"(.*)\",");
     rx.setMinimal(true);
     int yy = rx.indexIn(http_response);

      qDebug() << yy;
      qDebug() << rx.cap(0);
      qDebug() << rx.cap(1);

}

gives me
1
""key":"a99fdd865c2-10000","
"a99fdd865c2-10000"


For more details see:
http://doc.trolltech.com/4.6/tools-regexp.html

Thanks,
Christo

On 25 Mar 2010, at 07:32, Meir Yanovich wrote:

> Hello all
> im trying to extract value by key from http Json kind of struct by   
> using simple RegExp
> here is my code i like to extract the key value from the string:
>
> QString http_response = "{\"key\":\"a99fdd865c2-10000\",\"oid\": 
> 1000055,\"expires\":0000,\"secret\":\"509c03edfdc7\",\"sign\": 
> \"f0dd9e5226d0e77\"}";
> // or even if i use QRegExp::escape on the string it dosn't work
> QRegExp rx("\"key\"\:(.*?)\",");
> int yy = rx.indexIn(http_response);
> QString cap = rx.cap(1);
>
> but i cant capture the string and the yy variable always gives me -1
> i tested this regexp in this regexp tester : http://gskinner.com/RegExr/ 
>  and its working fine
> what im doing wrong here ?
>
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> Qt-interest at trolltech.com
> http://lists.trolltech.com/mailman/listinfo/qt-interest

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