int offset = 0;
        while (offset < value.length()) {
            final int unicodeChar = value.codePointAt(offset);
            if (Character.isISOControl(unicodeChar)) {
                throw failure(String.format("%s cannot contain ISO control character '\\u%04x'.", name, unicodeChar));
            }
            if ('\\' == unicodeChar || ('/' == unicodeChar && !allowSlash)) {