Support for catch of prompt answer

I work on a report based on a query with three prompts:

In my example below the prompts are:

1. "Räkenskapsår//period"
2. "Ansvarigt Kostnadsställe/grupp (Optional)"
3. "Företag (Optional)"

I want to catch the user respons for each promptanswer.

With the function PromptSummary I catch:

" *** Query Name:Ack ***

    Räkenskapsår/period SEP 2015

    Ansvarigt Kostnadsställe/grupp (Optional)INFORMATION MANAGEME

    Företag (Optional)"

On Bob I found this:

Replace(Replace(
Substr( PromptSummary() ; Pos( PromptSummary() ; "    " ) ;
( Length(PromptSummary()) +2 - (Pos( PromptSummary() ; "    " )*NumberOfDataProviders())) / NumberOfDataProviders() )
; ";" ; ", ");"    ";"")

wich results in

"Räkenskapsår/period SEP 2015

Ansvarigt Kostnadsställe/grupp (Optional)INFORMATION MANAGEME

Företag (Optional)"

That's a start, but not what I want.

Instead I were trying with this:

=Substr(PromptSummary();Pos( PromptSummary() ; "period" )+7;8)

This gets exactly what I want: "SEP 2015"

Not so nice to search for a word in the promptstring, and not so nice to manually enter how many characters to add for start of substring.

When it comes to next promptanswer it's harder to perform:

With this try:

=Substr(PromptSummary();Pos( PromptSummary() ; "grupp" )+16;100)

I get not only the promptanswer, I get the hole tail of the string. Of course I could try to check how long the string is. But I am at the point to ask for a function I haven't found in webi:

I want a function that takes care of this, something like:

promptanswer(dataprovider;promptdimension;headeroption;userrespons)

In my case

prompt_period=promptanswer(query_A;räkenskapsår/period;No;Value)

which would give me "SEP 2015" from my example.

This function would be permissive for if the query or object would change name or structure. I think its cool with all the substringing but its very intolerant. 

Or is there any other way that I have found yet?

/Henrik