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

[Meir Yanovich]

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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