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use strict;
use warnings;
...
my $example = "FOO CO COM BAR MOC SEC";
$example =~ s/($searchpat)/$replace{$1}/g;
print "$example\n";

FOO MOC SEC BAR COM COM

my $example = "MOC.COMPUTER.COM.FOO / SEC.SECT / CO";
$example =~ s/\b($searchpat)\b/$replace{$1}/g;
print "$example\n";

COM.COMPUTER.SEC.FOO / COM.SECT / MOC