/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main(String argv[]) {
        String str = "{\"json\": \"{\"created_at\":\"Sun Sep 24 11:10:52\"}\"}\n";
 
        str = str.replaceAll("(.*:\\s+)\"(\\{.*\\}).*(\\})", "$1$2$3");
 
        System.out.println(str);
    }
}

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