int start = skipSpace(address, 0); int index = expectPhrase(address, start); if (index > start) { start = skipSpace(address, index); }  return address.charAt(start) == ':' && address.charAt(address.length() - 1) == ';';
return address.endsWith(";") && address.indexOf(":") > 0;
    public boolean isGroup() {        if (address == null) {            return false;        }        int start = skipSpace(address, 0);        int index = expectPhrase(address, start);        if (index > start) {            start = skipSpace(address, index);        }        return address.charAt(start) == ':' && address.charAt(address.length() - 1) == ';';    }