This should be easy

[root@ve10:Active] config  b virtual bar list
virtual bar {
   snat automap
   destination 172.28.19.252:80
   ip protocol 6
   rules myrule
   profiles {
      http {}
      tcp {}
   }
}
[root@ve10:Active] config  b rule myrule list
rule myrule {
   when HTTP_REQUEST {
  if {[scan [HTTP::path] {/hangar%d} num] == 1} {
    switch $num {
      1 { node 200.200.200.101 }
      2 { node 2.2.2.2 }
      3 { node 3.3.3.3 }
      4 { node 4.4.4.4 }
      5 { node 5.5.5.5 }
      default {
         do something
      }
    }
    HTTP::uri [string map "/hangar$num/ /" [HTTP::uri]]
  } else {
     do something
  }
}
}

[root@ve10:Active] config  ssldump -Aed -nni 0.0 port 80
New TCP connection 1: 172.28.19.251(49995) <-> 172.28.19.252(80)
1360764488.7196 (0.0010)  C>S
---------------------------------------------------------------
GET /hangar1/services/reception HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: receptionservice.company.com

---------------------------------------------------------------

New TCP connection 2: 200.200.200.10(49995) <-> 200.200.200.101(80)
1360764488.7207 (0.0010)  C>S
---------------------------------------------------------------
GET /services/reception HTTP/1.1
User-Agent: curl/7.15.5 (i686-redhat-linux-gnu) libcurl/7.15.5 OpenSSL/0.9.8b zlib/1.2.3 libidn/0.6.5
Accept: */*
Host: receptionservice.company.com

---------------------------------------------------------------