That's weird since this regex does match this string when I test it.
Will have to reproduce and debug it (but won't have time until
Monday). In the meantime it would be great if you could create an
issue on 
http://jira.xwiki.org/browse/XE with information on how to
reproduce it.
Thanks for the report !
On Fri, Mar 4, 2016 at 9:54 PM, sautner <sautner(a)gmail.com> wrote:
  I'm testing upgrade from 7.4.2 to new version
8.0-rc-1.
 This check block my upgrade. Allowed namespace list [[[wiki:(?!xwiki)]]]
 does not matches namespace [wiki:X].
 <http://xwiki.475771.n2.nabble.com/file/n7598332/ScreenClip.png>
 My env. is  CentOS 6, WF 8.2, Java 1.8, PG 9.4
 Connection for upgrade is provided by
 "extension.repositories=maven-xwiki:maven:http://hosted-nexus"
 Server log don't throw anything.
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Thomas Mortagne