One Vs for Redirects

For this I'd use 'findclass'. First, define a data group with your redirects via the gui (iRules->Data Group List->create, give it a name and then use type 'string'). Define a space-separated list of the domains like:

www.my.foo.com www.foo.com

Where the following rule should redirect you to the www.foo.com domain if they come in with www.my.foo.com:

 
 when HTTP_REQUEST {  
     set Host [findclass [HTTP::host] your_datagroup_name " "] 
     if { $Host ne "" } { 
          HTTP::redirect $Host[HTTP::uri] 
          } 
  } 
 

I've not tested the iRule above but it should get you very close. I'd add an else statement to handle hosts that don't match.

HTH,

-Matt