New regex

[Ulrich Drepper]

As you might have seen, I've checked in a completely new regex
implementation in the 2.3 branch.  It was written by Isamu Hasegawa
from IBM Japan.

This implementaion is not only clean, it's actually conforming to the
POSIX standard!  What a change.

There are still some problems reported in the PTESTS test suite but I
believe those are actually bugs in the tests (and therefore in IEEE
2003.2).


Thanks a lot to Isamu and IBM for contributing this code.

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