Nice addition.

I would only change one thing: 

while (defined ($_ = $tail->read)) {
    if (/$regex/) {
        print;
        alarm 2;
    }
}

[download]

That will prevent separator lines after reading a line that was filtered.

In reply to Re^2: tf - tail a file and output separator line when inactive by imp
in thread tf - tail a file and output separator line when inactive by imp

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