We help IT Professionals succeed at work.

Java Pattern Mattcher

TheSilverBullet
on
500 Views
Last Modified: 2008-01-09
I have
import java.util.regex.Matcher;
import java.util.regex.Pattern;


public class TestPrim {
      public static void main(String args[]){
            

            Pattern p = Pattern.compile("\\d*");
      
    Matcher m = p.matcher("ab333e66f");
    boolean b = false;
    while(m.find()) {
      System.out.print(m.start() + m.group());
}

      }
}


the output is : 012333566689
however I cant understand how I got 9 whilst the highest index is 8 in my string, any clarification ?
Comment
Watch Question

CERTIFIED EXPERT
Top Expert 2016
Commented:
Unlock this solution and get a sample of our free trial.
(No credit card required)
UNLOCK SOLUTION
Bart CremersJava Architect

Commented:
Matches:

At index 0 -> empty string
At index 1 -> empty string
At index 2 -> 333
At index 5 -> empty string
At index 6 -> 66
At index 8 -> empty string
At index 9 -> empty string

If you want to match a single digit, do as CEHJ says and drop the *.
If you want to match at least one digit, use "\\d+"
Mick BarryJava Developer
CERTIFIED EXPERT
Top Expert 2010

Commented:
because it is matching the empty string at the *end of the line*
CERTIFIED EXPERT
Top Expert 2016

Commented:
:-)

Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Thanks for using Experts Exchange.

Please provide your email to receive a sample view!

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.