I'm tempted to reply that neither will I waste my time answering if I do know the answer, and thank you very much, but will confine myself to the following.

I don't think the expression  /\Q@array/ is compiling the regex you expect. Consider

c:\@Work\Perl>perl -wMstrict -le
"my @array = ('acuser', 'sync_cmd', '2015-01-13');
 my $rx = qr/\Q@array/;
 print $rx;
"
(?^:acuser\ sync_cmd\ 2015\-01\-13)
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which doesn't seem to make much sense in the context of the given example data. Is this really what you want?