#!/usr/local/bin/perl -w
use strict;

my $data = do { local($/); <> };

print qq{$1\n} if ( $data =~ /(Testnok =[^>]+>)/s )
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Or all right on the command line. Prob a cleaner way to do this though,
but I dont have my Camel book with me. Bet this could be done better with a couple more switches.

perl -e 'print $1 if ( do{local $/; <>} =~ /(Testnok =[^>]+>)/s)' data
+.txt
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Wonko