Extract specific string

Question

I have the following QString that I want to extract only the access_token value which is "http%3a%2f%2fschemas.xmlsoap....." How to do that?

{"token_type":"http://schemas.xmlsoap.org/ws/2009/11/swt-token-profile-1.0","access_token":"http%3a%2f%2fschemas.xmlsoap.org%2fws%2f2005%2f05%2fidentity%2fclaims%2fnameidentifier=asdasr21321214a%2f%2fschemas.microsoft.com%2faccwresscontrolservice%2f2010%2f07%2fclaims%2fidentityprovider=https%3a%2f%2fdatamarket.accesscontrol.windows.net%2f&Audience=http%3a%2f%2fapi.microsofttranslator.com&ExpiresOn=1347332993&Issuer=https%3a%2f%2fdatamarket.accesscontrol.windows.net%2f&HMACSHA256=sFqvp2a2xXc3VBdxYZ6xHQf%2fKkOydnuX6VK7A6Yf55k%3d","expires_in":"599","scope":"http://api.microsofttranslator.com"}

mzelina · Accepted Answer · 2012-09-11 03:20:46Z

2

Check out QJson at http://qjson.sourceforge.net/.

You can easily parse a string into tokenized attributes. From the usage page:

QJson::Parser parser;
QString json = "{your json above}";
bool ok;
QVariant result = parser.parse (json, &ok);
qDebug() << result["access_token"].toString();

Have fun.

answered Sep 11, 2012 at 3:20

mzelina

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Valentin H · Accepted Answer · 2012-09-14 22:30:06Z

1

Quick and dirty, only for demonstration of QString::section:

QString Data("{...you json data...}");
QString AccessToken = data.section("access_token\":\"",1).section("\"",0,0);

Consider: QString::section is slow and heavy, creating QStringList and converting tokens to RegExp in background. But I still do use it frequently in some cases.

answered Sep 14, 2012 at 22:30

Valentin H

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Ria · Accepted Answer · 2012-09-11 04:16:20Z

1

Try this regex:

\"access_token\":\"([^\"]*)\"

explain:

( subexpression )
Captures the matched subexpression and assigns it a zero-based ordinal number.

[^ character_group ]
Negation: Matches any single character that is not in character_group. By default, characters in character_group are case-sensitive.

answered Sep 11, 2012 at 4:16

Ria

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