java to validate instagram url using regular expression

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package com.mycompany.mavenproject1;

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

/**
 *
 * @author ASUS
 */
public class Helloworld {
 private static String facebookurl="";
     private static boolean instagram(String url){
        Pattern p = Pattern.compile("^(https\\:\\/\\/)?(www\\.)?(instagram\\.com)\\/.+$");
        Matcher m=p.matcher(url);
        boolean matches = m.matches();
        return matches;
    }
   public static void main(String[] args){

       System.out.println("result of facebook url"+ facebook(facebookurl));
   } 
}