Also please have a look at bug #776341, which is why I think that the following should perhaps be clarified a bit more: - that multiple matches of the same field are not supported. e.g. release a=testing,a=unstable will neither have the effect of AND nor OR, it is simply "the last one wins" - how the POSIX EREs work in practise (see #776341).
Cheers, Chris.
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