...
my $regexpaaa=qq/-i -e \'\^AAA=\'/;
my @command2 = ("ssh us\@ip -o BatchMode=yes grep $regexpaaa $dir/$file");
...

##</code><code>##

...
my $regexpaaa=qq/-i -e \'\^AAA=\'/ -e \'\^XXXXX\ AAA=\'/;
my @command2 = ("ssh us@pp -o BatchMode=yes grep $regexpaaa $dir/$file");
...