highlighting search results from within a function

I've got a function:

function! XXXX()
execute '/this'
endfunction

and when I run it:

:call XXXX()

my cursor is positioned at the first 'this' but the text
is not highlighted (nor is the text of any of the other 'this'
highlighted).

If I go into search history, the search is there and if I
execute the historical search, the 'this's all highlight.

So, my question is: how can I do a search from within a
function and have the search results highlighted?

Thanks

Richard
--
Quis custodiet ipsos custodes

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