parsing string to capture the required data

I am reading this string …i only want to get the 1 that is in response body …how to parse this string to get required data?

6D8A60D9
connected
3056
request sent
client disconnected.
Data from server captured in readString:

HTTP/1.1 200 OK
Cache-Control: private, max-age=0
Content-Type: text/xml; charset=utf-8
Server: Microsoft-IIS/8.5
X-AspNet-Version: 4.0.30319
X-Powered-By: ASP.NET
Date: Thu, 19 Jul 2018 09:11:52 GMT
Connection: close
Content-Length: 90

<?xml version="1.0" encoding="utf-8"?>
<string xmlns="http://www.amaazia.com/">1</string>
End of readString
==================

Is that data in a string (null terminated character array) or a String object?

code:

 String readString;
  String line ;
  int lines_received = 0;
  while (client.connected() && !client.available()) delay(1); //waits for data
  while (client.connected() && client.available()) { //connected or data available
    char c = client.read();
    readString.concat(c);

  }
  delay(1);
  client.stop();
  Serial.println(F("client disconnected."));
  Serial.println("Data from server captured in readString:");
  Serial.println();
  Serial.print(readString); //prints readString to serial monitor
  Serial.println();


  Serial.println("End of readString");
  Serial.println("==================");
  Serial.println();

Akshya123 have gone through this:

groundFungus:
Is that data in a string (null terminated character array) or a String object?

Sir,It is in String.

It is not a good idea to use the String (capital S) class on an Arduino as it can cause memory corruption in the small memory on an Arduino. This can happen after the program has been running perfectly for some time. Just use cstrings - char arrays terminated with '\0' (NULL).

...R