Validate the ZIP code with Java Regular expressions

In order to match the ZIP code using regular expression, we use the matches method in Java. The java.lang.String.matches() method returns a boolean value which depends on the matching of the String with the regular expression.

Declaration − The java.lang.String.matches() method is declared as follows −

public boolean matches(String regex)

Let us see a program which validates the ZIP code with Java Regular Expressions −

Example

public class Example {
   public static void main( String[] args ) {
      System.out.println(zipIndia("400709"));
      System.out.println(zipUS("10060"));
   }
   // validate zip
   public static boolean zipIndia( String z ) {
      return z.matches( "\d{6}" );
   }
   public static boolean zipUS( String z ) {
      return z.matches( "\d{5}" );
   }
}

Output

true
true