[PATCH] Testcase for another regex bug]

[Ulrich Drepper]

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Isamu Hasegawa wrote:

> The problem was that there are some defects in the evaluations of back
> references.  And I needed to restructure these evaluations.
> (I'm sorry for such a big patch.)

Thanks, I've applied the patch.  Looks good.


> However, it might not be a sufficient patch, since dc.sed of sed-3.02
> seems to fall infinite loop.
> On the other hand, perhaps it might not be a bug, because the infinite
> loop of dc.sed seems not to be in regex but in the dc.sed script, and
> the behavior of regex was a bit changed from old regex.
>   (e.g. Executing the following command returns the result "NG".
>    $ echo aa | sed 's/\(a\+\)\{3\}/NG/'
>    However, "\(a\+\)\{3\}" shouldn't match with "aa", should it?
>    We fix these some dubious behaviors, and it might prevent dc.se
>    from desirable behavior.)

This indeed shouldn't match.  If dc.sed relies on this it's broken.


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