Smartest way to do a class lookup case insensitive

[root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   pool foo
   destination 172.28.19.79:80
   ip protocol 6
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@ve10:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
   set host [HTTP::host]
   set uri [HTTP::uri]
   if { [class match -- "http://[string tolower $host$uri]" equals redirection_class] } {
      HTTP::redirect [class match -value "http://[string tolower $host$uri]" equals redirection_class]
   }
}
}
[root@ve10:Active] config  b class redirection_class list
class redirection_class {
   "http://www.a.com/b" { "http://www.c.com/d" }
}

[root@ve10:Active] config  curl -I http://172.28.19.79/b -H "Host: www.a.com"
HTTP/1.0 302 Found
Location: http://www.c.com/d
Server: BigIP
Connection: Keep-Alive
Content-Length: 0

[root@ve10:Active] config  curl -I http://172.28.19.79/B -H "Host: www.A.com"
HTTP/1.0 302 Found
Location: http://www.c.com/d
Server: BigIP
Connection: Keep-Alive
Content-Length: 0