Regex

[Natasha Basu]

This is a question from the certification book by Kathy Sierra Chapter 6

import java.util.regex.*
class Regex2{
public static void main (String[] args){
Pattern p=Pattern.matcher(args[0]);
Matcher m=p.matcher(args[1]);
boolean b=false;
while(b=m.find()){
System.out.println(m.start() + m.group());
}
}
}
And the command line:
java Regex2 "\d*" ab34ef

and the answer is 01234456

I would like to know how that answer was arrived at?

[Ulf Dittmer]

That's a FAQ: http://faq.javaranch.com/java/ScjpFaq#kb-regexp

[Natasha Basu]

Thank you. I could not understand the digit 6 in the end. Thank you again