Please pay attention to all the advice given to you thus far -- it will help you in future attempts to seek help here.

In the meantime, I suspect this is your problem:

     for my $string (@strings) {
        if ( $logLines =~ /$string/ ) {
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If my gut feel be aright, the problem here is that you are feeding it a string where a regular expression is expected.

Consider using quotemetato convert:

     for my $string (@strings) {
        my $regex = quotemeta $string;
        if ( $logLines =~ /$regex/ ) {
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But this is just a guess -- all the other advice on this thread should be followed if this does not solve your problem. As a rule, we can't fix what we can't run.