doubt on regex

[j bande]

import java.util.regex.*;
class Regex2{
public static void main(String[] args){
Pattern p=Pattern.compile(args[0])
Matcher m=p.matcher(args[1]);
boolean b=false;
while(b=m.find()){
System.out.println(m.start()+m.group()+"");
}
}
}
and we give java Regex2 "\d\s\w" "12s 4w 33 1"


output for this is: 44 w 93

Can anyone explain me this. And i don't have much idea on this regex class also. can anyone provide clear explanation about this topic.
Thanks in Advance.

[Christophe Verré]

Funny enough that it actually outputs "83 1", because it looks for the following sequence :
\d A digit: [0-9]
\s A whitespace character: [ \t\n\x0B\f\r]
\w A word character: [a-zA-Z_0-9]

So 8th position, there is "3 1".

Or am I missing something ?