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startblock=\013
endblock=\034

$config{'startblock'} = "\013";
$config{'endblock'} = "\034";

$in_msg =~ s/$config{'startblock'}//g;
$in_msg =~ s/$config{'endblock'}//g;

# all in quotes
...
$ack = "<ack msg here>";
$ack =~ s/(.*)/$config{'startblock'}\1$config{'endblock'}/;