Re: Negation of Remote_Addr in SetEnvIf directive

[Krzysztof Dajka <alteriks@xxxxxxxxx>]

Apache 2.0 and later uses PCRE, and neither of those expressions mean
what you're describing.  SetEnvIf itself doesn't negate the result of
the regex match with a flag.

I don't fully understand your logic, but If you want your SetEnvIf to
only take action when the remote address doesn't begin with "10.", try
something like:

^((?!10\.).+)

Thanks a lot this regex works like a charm.