Zip Code validation using Java Regular Expressions

The zip code can be validated using the java.util.regex.Pattern.matches() method. This method matches the regular expression for the zip code and the given input zip code and returns true if they match and false otherwise.

A program that demonstrates this is given as follows:

Example

 Live Demo

public class Demo {
   public static void main(String args[]) {
      String zipCode = "83592-1537";
      String regex = "\d{5}(-\d{4})?";
      System.out.println("The zip code is: " + zipCode);
      System.out.println("Is the above zip code valid? " + zipCode.matches(regex));
   }
}

Output

The zip code is: 83592-1537
Is the above zip code valid? true

Now let us understand the above program.

The zip code is printed. The Pattern.matches() method matches the regular expression for the zip code and the given input zip code and the result is printed. A code snippet which demonstrates this is as follows:

String zipCode = "83592-1537";
String regex = "\d{5}(-\d{4})?";

System.out.println("The zip code is: " + zipCode);
System.out.println("Is the above zip code valid? " + zipCode.matches(regex));