Untested speculation, but based purely upon reading your post, I'd guess that the problem is that this:

(?<!10\.20\.11\.99\s)kvm-test-v06

[download]

is anticipating exactly 1 whitespace char between the IP address and the name and perhaps some of your lines have more than one?

Does this: (?<!10\.20\.11\.99)\s+kvm-test-v06 more closely meet you needs?

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

The start of some sanity?

In reply to Re: Misunderstanding negative look behind by BrowserUk
in thread Misunderstanding negative look behind by bronto

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