Formatting IP:Port string to

Question

I\'m trying to make a little chat program for experimentation, but seeing as I\'m not the best Java programmer, I don\'t know how to separate a port from an IP where they are bo

Answer 1

You can use pattern matcher in java to get the address and the port information and by the way you can validate the input string as well.

Pattern pattern = Pattern.compile(REGEX_FOR_IPADDRESS_WITH_PORT);
Matcher matcher = pattern.matcher("127.0.0.1:80");
if (matcher.matches()) {
    System.out.printf("host = %s, port = %s%n", matcher.group(1), matcher.group(2));
} else {
    System.out.println("Invalid Ip Address");
}

You can have multiple regular expression to validate V4 and V6 addresses. Hope this would help.