Fix regexp parsing with RE_CONTEXT_INDEP_OPS

[Andreas Schwab]

Ulrich Drepper <drepper@redhat.com> writes:

> Andreas Schwab wrote:
>> Posixly the
>> behaviour of "(*)" is undefined, which is probably why it's not in
>> rxspencer.  But it looks like it's part of traditional egrep
>> behaviour,
>
> Where do you have this "traditional egrep behavior" information from?

It's part of the orignal GNU grep testsuite.  I didn't claim it's
first hand information.

> Solaris' egrep fails with errors for "(*)b" and "()b".

Which is ok, since POSIX makes it undefined.  Which errors, btw?

> Which implementation behaves the way you expect it?

The old GNU regexp implementation.  The current behaviour is violates
the specs for RE_CONTEXT_INDEP_OPS, and the error message does not
make any sense.  This is independent of the actual GNU/BSD/Solaris
etc. egrep behaviour.

Andreas.

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