Irule for lowercase

what about this one?

 config

root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm virtual bar
ltm virtual bar {
    destination 172.28.24.10:0
    ip-protocol tcp
    mask 255.255.255.255
    pool foo
    profiles {
        http { }
        tcp { }
    }
    rules {
        qux
    }
    source 0.0.0.0/0
    source-address-translation {
        type automap
    }
    translate-port disabled
    vs-index 60
}
root@(ve11a)(cfg-sync In Sync)(Active)(/Common)(tmos) list ltm rule qux
ltm rule qux {
    when RULE_INIT {
  set static::uri "/myBlock.Profile.com/Pages"
  set static::uri_lower [string tolower $static::uri]
}
when HTTP_REQUEST {
  set uri [HTTP::uri]
  set uri_lower [string tolower $uri]
  if { $uri_lower eq $static::uri_lower } {
    if { $uri ne $uri_lower } {
      HTTP::redirect "http://[HTTP::host]$uri_lower"
    }
  }
}
}

 test

[root@ve11a:Active:In Sync] config  curl -I http://172.28.24.10/myBlock.Profile.com/Pages
HTTP/1.0 302 Found
Location: http://172.28.24.10/myblock.profile.com/pages
Server: BigIP
Connection: Keep-Alive
Content-Length: 0

[root@ve11a:Active:In Sync] config  curl -I http://172.28.24.10/myblock.profile.com/pages
HTTP/1.1 404 Not Found
Date: Wed, 06 Aug 2014 14:38:41 GMT
Server: Apache/2.2.3 (CentOS)
Content-Type: text/html; charset=iso-8859-1