Java- Regex for a string not containing a substring followed by any characters

Question

I want to find a regex in Java for a Windows Server 2008 OS version which does not contain "R2" Regex I am currently using -

(?i)Win\w*\s*(?i)Server\s*(2008)\s*(?!R2)\s*\w*

Possible values:

Windows Server 2008 datacenter - Matches correctly
Windows Server 2008 - Matches correctly
Windows Server 2008 R2 Datacenter - Does not match
Windows Server 2008 r2 datacenter - Does not match
Windows Server 2008 R2 - Matches incorrectly (because R2 fits into \w* in the regex)

What am I doing wrong in the regex?

Remove the \s* after your lookahead. Are you using this in context of String matches()? — Sebastian Proske
– Sebastian Proske, Commented Mar 10, 2017 at 15:10
No. I am using pattern.matcher from java.util.regex. But removing \s worked for regex matcher too. Thanks — appu_coder
– appu_coder, Commented Mar 11, 2017 at 10:35

m87 · Accepted Answer · 2017-03-10 15:41:32Z

1

You may consider using the following regex :

(?i)Win\w*\s*Server\s*(2008)(?!\sR2).*?$

see regex demo

Java ( demo )

import java.util.regex.Matcher;
import java.util.regex.Pattern;

class RegEx {
    public static void main(String[] args) {
        String s = "Windows Server 2008 datacenter";
        String r = "(?i)Win\\w*\\s*Server\\s*(2008)(?!\\sR2).*?$";
        Pattern p = Pattern.compile(r);
        Matcher m = p.matcher(s);
        while (m.find()) {
            System.out.println(m.group());
        }
    }
}

edited Mar 10, 2017 at 15:41

answered Mar 10, 2017 at 15:29

m87

4,5313 gold badges18 silver badges31 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Eddie Martinez · Accepted Answer · 2017-03-10 15:32:16Z

0

Regular expression to match string if it contains R2

private boolean isR2(String text) {
         return (text.toLowerCase().matches(".*r2.*"));
    }

without regular expression, you can do

private boolean isR2(String text) {
     return (text.toLowerCase().indexOf("r2")>0);
}

both match all your examples correctly:

Windows Server 2008 datacenter // false
Windows Server 2008 //false
Windows Server 2008 R2 Datacenter //true
Windows Server 2008 r2 datacenter //true
Windows Server 2008 R2 //true

edited Mar 10, 2017 at 15:32

answered Mar 10, 2017 at 15:16

Eddie Martinez

13.9k15 gold badges87 silver badges109 bronze badges

Collectives™ on Stack Overflow

Java- Regex for a string not containing a substring followed by any characters

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related