[PATCH] Implement REG_STARTEND extension to POSIX regex functions

[Paolo Bonzini]

> This looks sufficiently simple t add.  But you should not regard this as
> a card blanche for further additions.  The code is already complex enough.

Thanks.  I agree and no had other extensions in mind.  But this one is
actually useful and maybe its being more widespread could lead to POSIX
blessing -- and the code to implement it is also well localized.

Paolo