codewars-011: Triple trouble

https://www.codewars.com/kata/55d5434f269c0c3f1b000058/train/java

package codewars;
import java.util.regex.*;
public class Kata{
  public static int TripleDouble(long num1, long num2){
    String str1 = String.valueOf(num1);
    String str2 = String.valueOf(num2);
    String regex = ".*(\\d)\\1{2}.*";
    Pattern p = Pattern.compile(regex);
    Matcher m = p.matcher(str1);
    String d = "";
    while(matcher.find()){
      d = matcher.group(1);
    }
    if("".equals(d)){
      return 0;
    }else{
      return str2.matches(String.format(".*%s{2}.*",d)) ? 1 : 0;
    }
  }
}

How to match repeated digits using a regular expression

http://blog.sina.com.cn/s/blog_6154bf970100svhz.html

Java regex group:  http://blog.csdn.net/qinggreen/article/details/9139847#