HostPortMatcher.java

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class IPvXTest {

   static void match(String s) {
      Pattern p = Pattern.compile("(\\[(?<v6host>[0-9A-Fa-f:]+)\\]|(?<v4host>[^:/?#]*))(?::(?<port>\\d*))?");
      Matcher matcher = p.matcher(s);
      if (matcher.matches()) {
         String v6host = matcher.group("v6host");
         String v4host = matcher.group("v4host");
         System.out.printf("Host = %s Port = %s\n", v6host != null ? v6host : v4host, matcher.group("port"));
      } else {
         System.err.printf("%s doesn't match", s);
      }
   }

   public static void main(String[] args) {
      match("[::1]:11222");
      match("[ff01::1]:11222");
      match("[ff01::1]");
      match("127.0.0.1:11222");
      match("myhost");
      match("myhost:11222");
   }

}