What is the result(regex)? : Questions « File « SCJP

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

class MainClass {
  public static void main(String[] args) {
    Pattern p = Pattern.compile("\\d*");
    Matcher m = p.matcher("ab34ef");
    boolean b = false;
    while (b = m.find()) {
      System.out.print(m.start() + m.group());
    }
  }
}