simple regex

[ahmed yehia]

Hello
I have the below code runs fine but I dont get the output.

    
import java.util.regex.*;
 
class Regex2 {
public static void main(String[] args) {
        Pattern p = Pattern.compile("\\d*");
Matcher m = p.matcher("33");
boolean b = false;
while(b = m.find()) {
System.out.print(m.start() + m.group());
}
}
}

output:
0332

why would it print "2" at the end after group.

[Christophe Verré]

Because you are using "*", which means zero or more times. So after finding "33", it also finds a non matching empty string, at index 2.
It would work as expected if you'd use "+" instead.