Re: How do I get regexp from expect at gdb_expect?

[Daniel Jacobowitz <drow@false.org>]

On Mon, Jan 31, 2005 at 05:12:47PM -0500, Bob Rossi wrote:
> On Mon, Jan 31, 2005 at 05:03:54PM -0500, Daniel Jacobowitz wrote:
> > On Mon, Jan 31, 2005 at 05:00:50PM -0500, Bob Rossi wrote:
> > > It also tighten's up the MI output command matching, I honestly don't
> > > know how the -break-delete was getting eaten in the regular expression,
> > > unless $pattern happened to have a .*. Oops, in that case, I guess we
> > > aren't really validation much, anything could have come out of GDB, and
> > > it probably would have passed.
> > 
> > Your pattern doesn't start with an anchor.  -break-delete wasn't eaten;
> > we just started matching after it.
> 
> Please forgive my ignorance, I've been reading online as much as
> possible to understand tcl/expect ...
> 
> I understand how anchors work, however, I didn't realize you could start
> matching in the middle of what the 'buffer' is. If it started matching
> after it, does that mean it's skipped forever? So basically, you can
> match a subset of the output, and the rest is lost (never matched)?

That's correct.

> If that's the case, the testsuite for the MI is matching even less than
> I thought. GDB could output almost anything, but then just have to match
> the last string, and the testcase would pass, correct?

Yes.  Sometimes this is even deliberate - fixing it would be
interesting, but probably quite hard.

-- 
Daniel Jacobowitz