Question

How to check if a string contains only 5 digits in Java

Answer 1

import java.util.regex.Pattern;

public class MyClass {
    public static void main(String args[]) {
        Pattern pattern = Pattern.compile("\\d{5}");       
       
        String s = "12345";
        System.out.println(pattern.matcher(s).matches());

        s = "1234";
        System.out.println(pattern.matcher(s).matches());

        s = "123456";
        System.out.println(pattern.matcher(s).matches());
    }
}



/*
run:

true
false
false

*/

 

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