Parsing token in HTTP Response body using C#

[snehil_khanor]

I'm sending an HTTP POST request to google Client login and I'm getting this in respons:

SID=DQAAAGgA...7Zg8CTN
LSID=DQAAAGsA...lk8BBbG
Auth=DQAAAGgA...dk3fA5N

I used the below code to read the response:

Trace.WriteLine(new StreamReader(response.GetResponseStream()).ReadToEnd());

Now in this response i want to use only the value of Auth token. Can any one please help me on how to extract only that value from the response. Thanx!

[Momerath]

You can use IndexOf:

String myString = (new StreamReader(response.GetResponseStream()).ReadToEnd();

int n = myString.IndexOf("Auth=");
if (n >= 0) {  // Make sure we found it at all
    String token = myString.SubString(n+5); // +5 to skip the "Auth="
    ... process token
}

[snehil_khanor]

Thanx! That'll do.. but I was thinking if this can be done using RegEx.. I hear that thats much quicker and efficient..

[Momerath]

If someone told you it was quicker and efficient, don't ever trust them again. Regex is an expensive process.