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Date: Fri, 20 Jun 2008 13:14:45 +0200
From: Gabor Kovesdan <gabor@FreeBSD.org>
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To: Jaakko Heinonen <jh@saunalahti.fi>
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Cc: Doug Barton <dougb@FreeBSD.org>, current@FreeBSD.org,
	Diomidis Spinellis <dds@aueb.gr>, hackers@FreeBSD.org,
	"Sean C. Farley" <scf@FreeBSD.org>, Max Khon <fjoe@samodelkin.net>
Subject: Re: CFT: BSD-licensed grep [Fwd: cvs commit:	ports/textproc/bsdgrep
 Makefile distinfo]
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Jaakko Heinonen escribió:
> On 2008-06-17, Gabor Kovesdan wrote:
>   
>>> egrep: empty (sub)expression
>>>
>>>       
>> I've looked at this and I have a patch with a workaround: 
>> http://kovesdan.org/patches/grep.dougb.diff
>>     
>
> Unfortunately this breaks things. For example:
>
> $ grep -E '(test||test)' /dev/null
> grep: parentheses not balanced
> $ grep -E '(test|\|)' /dev/null
> grep: parentheses not balanced
> $ grep -E '\(|test)' /dev/null
> (should give an error but it hangs)
>   
Ugly enough, but seems to be fixed in my working copy. Thanks for the 
report.

Gabor