Re: [bug-gawk] Regex problem with gawk 4.1.2

[Henrik Levkowetz]

Hi Arnold, Andy,

On 2015-05-14 13:09, Aharon Robbins wrote:
> Hi. Thanks for the report.

You're welcome.  Thanks for your work on gawk!

> As Andy answered, there is a bug in this area. If you change your code to
> 
>       if (ref ~ /[[,]/) { print "whoo"; }
> 
> you should be OK. I plan to release 4.1.3 fairly soon, since this is
> a fairly critical bug.

Ack.  There's actually a bunch of similar regexes in my code, so I'd have to
fix all of them in that case; fortunately it's also feasible for me to advise
my users to go with another version of gawk than 4.1.2; one user who ran into
this downgraded to 4.1.1. and things were fine.

Thanks again to both of you for your work and for your replies :-)


Best regards,

        Henrik


> Thanks!
> 
> Arnold
> 
>> Hi,
>>
>> One of my venerable awk programs, which I've tried to keep compatible with 
>> awk,
>> nawk, and gawk for close to 15 years, suddenly broke when run with gawk 
>> 4.1.2.
>>
>> I've reduced the problem to the following little snippet.  The problem seems
>> to be with inclusion of an unquoted '[' character within the regex bracket
>> expression, but not as the first character.  According to the manual this 
>> should
>> work [1], and it has indeed worked for me as long as I've worked with awk, 
>> but
>> doesn't do so any more in 4.1.2:
>>
>> #!/opt/local/bin/gawk -f
>> BEGIN {
>>   ref = ",";
>>   if (ref ~ /[,[]/) { print "whoo"; }
>> }
>>
>> My copy of gawk 4.1.2 is running on OS X, version 10.9.5, installed with 
>> macports,
>> and gives its version number as "GNU Awk 4.1.2, API: 1.1"
>>
>>
>> Best regards,
>>
>>      Henrik
>>
>> [1] 
>> http://www.gnu.org/software/gawk/manual/html_node/Bracket-Expressions.html
>

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