Regex Program

[Srinivas Katta]

Hi,

I have executed the below Program from K&B

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.print(m.start() + m.group());
}
}
}

And the command line:
java Regex2 "\d*" ab34ef

My assumption is that the output would be 0123445 but the actual output displayed is 01234456. I do not understand how?

Thanks
Srinivas

[Christophe Verré]

Check this FAQ.

[Sahil Kapoor]

\d* eseentially implies zero or more numeric digits.

Zero length match can occur in several places and one out of it is

After the last character of source data. in your example 6 !!!

See pg 500 in K&B !!!