[root-tail] how to filter output?

With tail -f /some/file, you can apply a pattern to grep for.
e.g.
tail -f /some/file | egrep "some expression"
This will only show lines with "some expression" in it. This is what I would like to do with root-tail. I've searched the net, but it doesn't seem like somebody has ever needed that, because there's nothing to find about the subject. (little bit weird, I can't be the only one that would like this feature).
Is it possible to filter the output that root-tail puts on-screen?

Ehm... is there really nobody who can help me with this?

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