http domain redirect

I think the general problem you're having is that you're trying to redirect on URI but only evaluating the host value. I see three possible options here:

1. Create two separate data groups - one for URI paths and one for host values

   ltm data-group internal myhosts {
       records {
           domain1.de {
               data domain.com
           }
           domain2.de {
               data domain.com
           }
       }
       type string
   }
   
   ltm data-group internal myuris {
       records {
           / {
               data /de-de
           }
           /careers {
               data /de-de/careers
           }
       }
       type string
   }
   
   when HTTP_REQUEST {
       set myhost [class match -value [string tolower [HTTP::host]] equals myhosts]
       set myuri [class match -value [string tolower [HTTP::uri]] starts_with myuris]
   
       set redirect 0
       if { $myhost ne "" } { 
           set redirect 1 
       } else {
           set myhost [HTTP::host]
       }
       if { $myuri ne "" } { 
           set redirect 1    
       } else {
           set myuri [HTTP::uri]
       }
   
       if { $redirect } {
           HTTP::redirect "http://${myhost}${myuri}"
       }    
   }
   

2. Create a single data group that incorporates host and URI

   ltm data-group internal mypaths {
       records {
           domain1.de/ {
               data domain.com/de-de
           }
           domain1.de/careers {
               data domain.com/de-de/careers
           }
       }
       type string
   }
   
   when HTTP_REQUEST {
       set mypath [class match -value [string tolower [HTTP::host][HTTP::uri]] starts_with mypaths]
   
       if { $mypath ne "" } {
           HTTP::redirect "http://$mypath"
       }
   }
   

3. Assuming the host is only going to change between a very small set of values, just build a data group for URIs

   when HTTP_REQUEST {
       switch [string tolower [HTTP::host]] {
           "domain1.de" -
           "domain2.de" {
               HTTP::redirect "http://domain.com[HTTP::uri]"
           }
       }
   
       set myuri [class match -value [string tolower [HTTP::uri]] starts_with myuris]
       if { $myuri ne "" } {
           HTTP::redirect "http://[HTTP::host]${myuri}"
       }
   }
   

Arguably I think the third option would be the easiest to manage, with option 2 being the most difficult.