Test failures about regexp

[Xin Dong]

Hi all,
I compiled octave 3.2.2 on a x86_64 linux machine. When I run the make test,
I got several failed tests related to regexp, like the following one:

  ***** assert(regexp('Iraq','q(?!u)'),4)
!!!!! test failed
regexp: Invalid preceding regular expression in pattern (q(?!u))

It may not be a big deal for me, but I still want to know how to fix it.

Thanks,
Xin
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