Re: [gawk] RE bug??

[Stephen Davies]

G'day Bob.
Now I am even more confused.
Here is the output that I see here:

bash-3.00$ echo Silver | awk '/[[:upper:]][[:upper:][:digit:]]+/'
bash-3.00$ echo Silver | awk '/[A-Z][A-Z0-9]+/'
bash-3.00$ echo Silver | LC_COLLATE=en_US awk '/[A-Z][A-Z0-9]+/'
bash-3.00$ echo Silver | LC_COLLATE=POSIX awk '/[A-Z][A-Z0-9]+/'
bash-3.00$ awk --version
GNU Awk 3.1.4

All of the above is exactly what I would expect and believe to be 
correct. The pattern says (I believe) that I want an upper character 
followed by one or more upper or numeric characters. 
The second and subsequent characters of Silver are neither so it should 
not match - as shown above.

I do not understand how your results can be.

Cheers and thanks,
Stephen


On Fri, 8 Jul 2005 12:15 pm, Bob Proulx wrote:
> Stephen Davies wrote:
> > Stepan Kasal wrote:
> > > "Silver" and "Actinium" both match /[[:upper:][:digit:]]+/ and
> > > /[A-Z][A-Z0-9]+/
> > How do Silver and Actium match  /[A-Z][A-Z0-9]+/ ?
> > 
> > I agree that my code was the original problem rather than gawk but 
do 
> > not see how the above can match.
> 
> It can depending upon your locale setting.  For example on my system:
> 
>   echo Silver | LC_COLLATE=en_US awk '/[A-Z][A-Z0-9]+/'
>   Silver
> 
> And it affects other programs that use the RE library too.
> 
>   echo Silver | LC_COLLATE=en_US grep -E '[A-Z][A-Z0-9]+'
>   Silver
> 
> But of course with LC_COLLATE=POSIX or C then it won't.  So whether it
> does or not is actually a it depends upon your locale setting.  Using
> the character classes [:upper:] and [:digit:] as you are doing avoids
> these issues.
> 
> Bob
> 

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