Regex to match version number for zero or more time

Question

I am writing a regex to match for following type of strings:

my-jar-1.2.3.5.jar
my-jar.jar 
my-jar-1.2.jar

With the help of A regex for version number parsing I figured out following

String pat = "^my-jar(-|\\.)?(?:(\\d+)\\.)?(?:(\\d+)\\.)?(?:(\\d+)\\.)?(\\*|\\d+).jar$";
Pattern patt = Pattern.compile(pat);
System.out.println("For my-jar-1.2.jar - " + patt.matcher("my-jar-1.2.jar").find());
System.out.println("For my-jar-1.2.3.5.jar - " + patt.matcher("my-jar-1.2.3.5.jar").find());
System.out.println("For my-jar.jar - " + patt.matcher("my-jar.jar").find());

Output is

For my-jar-1.2.jar - true
For my-jar-1.2.3.5.jar - true
For my-jar.jar - false

How do I include the last case in my regex?

Tim Biegeleisen · Accepted Answer · 2016-09-28T06:05:01.577

5

Would there be anything wrong with the following regex:

^my-jar(\-\d+|\-\d+(\.\d+)*)?\.jar$

Demo here:

Regex101

edited Sep 28 '16 at 06:05

answered Sep 28 '16 at 05:58

Tim Biegeleisen

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score 2 · Answer 2 · answered Sep 28 '16 at 05:58

This should work for you :

public static void main(String[] args) {
    String s1 = "my-jar-1.2.3.5.jar";
    String s2 = "my-jar.jar";
    String s3 = "my-jar-1.2.jar";

    System.out.println(s1.matches("my-jar(?:\\.|\\-(\\d+.)+)jar"));
    System.out.println(s2.matches("my-jar(?:\\.|\\-(\\d+.)+)jar"));
    System.out.println(s3.matches("my-jar(?:\\.|\\-(\\d+.)+)jar"));
}

O/P :

true true true

"my-jar(?:\\.|\\-(\\d+.)+)jar" ==> Starts with my-jar followed by either a "." or a - and one or more sets of <digit>. and then `jar.

score 1 · Answer 3 · answered Sep 28 '16 at 06:00

1

Can you try this

^my-jar(-|\\.)?(?:(\\d*)\\.)?(?:(\\d*)\\.)?(?:(\\d*)\\.)?(\\*|\\d*).jar$

answered Sep 28 '16 at 06:00

mhasan

3,703
1
18
37

Not scalable. What if the OP wants to have version with 5 levels? i.e, 1.2.3.4.5? – TheLostMind Sep 28 '16 at 06:02
@TheLostMind... Agreed – mhasan Sep 28 '16 at 06:03

SamWhan · Answer 4 · 2016-09-28T06:07:57.033

Try

^my-jar(?:-\d+(?:\.\d+)*)?\.jar$

It matches the mandatory filename, my-jar, and then has an optional non-capturing group, which is matched if an hyphen followed by digits comes next. Then, still inside the first optional group, there's another non capturing group that can be repeated any number of time (0-...) with a commencing dot followed by digits.

Finally, whether the optional group has been matched, or not, it ends by matching the .jar sequence.

Check it out at regex101 here.

Regex to match version number for zero or more time

4 Answers4

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