两个条件，组合控制

#        if ($query_string ~* "mod=viewthread&tid=([0-9]+)((&highlight=(.*))|(&extra=(.*)))?$")

#        {

#           set $itid $1;

#           rewrite ^([^\.]*)/forum\.php$  http://xxx.xxx.com/thread-$itid-1-1.html? permanent;

#        }

set $has_authorid ‘0‘;

        set $itid ‘0‘;

if ($query_string ~* "&authorid=")

{

set $has_authorid ‘1‘;

}

if ($query_string ~* "mod=viewthread&tid=([0-9]+)((&highlight=(.*))|(&extra=(.*)))?$")

{

set $itid $1;

}

set $redirect_thread  "$has_authorid$itid";

if ($redirect_thread ~ ‘0([1-9]\d+)‘)

{

rewrite ^([^\.]*)/forum\.php$  http://xxx.xxx.com/thread-$itid-1-1.html? permanent;

}