* <li>os.version: The operating system version</li>
 * </ul>
 * <p>
 * Supported OS families include:
 * <ul>
 * <li>windows: All Windows variants</li>
 * <li>win9x: Windows 95, 98, ME, CE</li>
 * <li>winnt: Windows NT variants</li>
 * <li>unix: Unix-like systems (including Linux)</li>
 * <li>mac: macOS (including Darwin)</li>
 * <li>os/2: OS/2 variants</li>
 * <li>netware: Novell NetWare</li>
 * <li>dos: DOS variants</li>

     */
    private static final String FAMILY_WIN9X = "win9x";

    /**
     * OS family that can be tested for. {@value}
     */
    public static final String FAMILY_NT = "winnt";

    /**
     * OS family that can be tested for. {@value}
     */
    private static final String FAMILY_OS2 = "os/2";

    /**
     * OS family that can be tested for. {@value}
     */

     * it will match that many characters <i>or less</i>.
     * <p>
     * Wildcard expressions will not filter workgroup names or server names.
     *
     * <blockquote>
     *
     * <pre>
     * winnt&gt; ls c?o*
     * clock.avi                  -rw--      82944 Mon Oct 14 1996 1:38 AM
     * Cookies                    drw--          0 Fri Nov 13 1998 9:42 PM
     * 2 items in 5ms
     * </pre>
     *

     * it will match that many characters <i>or less</i>.
     * <p>
     * Wildcard expressions will not filter workgroup names or server names.
     *
     * <blockquote><pre>
     * winnt> ls c?o*
     * clock.avi                  -rw--      82944 Mon Oct 14 1996 1:38 AM
     * Cookies                    drw--          0 Fri Nov 13 1998 9:42 PM
     * 2 items in 5ms
     * </pre></blockquote>
     *