import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Lookbehind1 {

    public static void main(String[] args) throws Exception {
        String regex = "(?<=http://www.)\\S+";
        
        Pattern p = Pattern.compile(regex);
        String url = "The url of the roseindia is ";
        url += "http://www.roseindia.net. Rohini";
        System.out.println(url);
        
        Matcher m = p.matcher(url);
        while (m.find()) {
            String msg = "Name of the company is : " + m.group();
            System.out.println(msg);
        }
    }
}