Issue with regex

Question

I want to write a regex where a string has (9 characters) and start with either "g" or "r" and then are all numbers afterward.

I have written this but it does not work:

public static void main(String[] args) {
    String id= "g57895452";
    String pattern = "/^g([0-9]+){8}$/";
    if (id.matches(pattern)) {
        System.out.println("true");
    } else {
        System.out.println("false");
    }
}

Instead of your if you can simply use System.out.println(id.matches(pattern)). — Pshemo
– Pshemo, Commented Jul 3, 2012 at 10:25

Igor Chubin · Accepted Answer · 2012-07-03 10:29:53Z

6

Corrected re:

"^[gr]([0-9]{8})$"

You need not + when you already has {8}.

Also you don't need () when you don't want to use the group further in the code.

"^[gr][0-9]{8}$"

edited Jul 3, 2012 at 10:29

answered Jul 3, 2012 at 10:20

Igor Chubin

65.1k14 gold badges132 silver badges149 bronze badges

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

2 Comments

user1416924 Over a year ago

it alwasy gives false for the given id,it is not returning true

Igor Chubin Over a year ago

@JaneRaj: Remove the slashes please

Alan Moore · Accepted Answer · 2012-07-03 11:30:21Z

1

Remove the / from start and end of your regex pattern, It will work.

edited Jul 3, 2012 at 11:30

Alan Moore

75.6k13 gold badges110 silver badges161 bronze badges

answered Jul 3, 2012 at 11:01

Pooya

4,5016 gold badges47 silver badges75 bronze badges

1 Comment

Alan Moore Over a year ago

True, but that's not the only problem.

Collectives™ on Stack Overflow

Issue with regex

2 Answers 2

2 Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

2 Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related