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Problem with upper and lowercase in awk

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# 1  
Old 08-15-2013
Problem with upper and lowercase in awk

My awk (GNU Awk 3.1.8 on Ubuntu 12.04) seems to ignore case.

cat file

awk '/[a-z]/&&/[A-Z]/{print $0,"[PASS]";next}{print $0,"[FAIL]"}' file

My result:
abc [PASS]
aBc [PASS]
123 [FAIL]

Correct result:
abc [FAIL]
aBc [PASS]
123 [FAIL]

Other example
cat d

awk '/[A-Z]/' d

This User Gave Thanks to Jotne For This Post:
# 2  
Old 08-16-2013
Interesting. gawk 3.1.5 does the same thing.
# 3  
Old 08-16-2013
Ahh, good I am not alone with this Smilie
Some other strange test

echo a | awk '/[A-Z]/'
<no output>

echo b | awk '/[A-Z]/'

echo aa | awk '/[A-Z]/'
<no output>

echo ab | awk '/[A-Z]/'

Single small a seems to work, but nothing else, strange
# 4  
Old 08-16-2013
This is probably a locale issue. Try:
echo b | awk '/[[:upper:]]/'

# 5  
Old 08-16-2013
[[:upper:]] [[:lower:]] seems to work correct.
But so should A-Z and a-z do also
# 6  
Old 08-16-2013
It has to do with locales as Scrutinizer mentioned:

Ranges and Locales - The GNU Awk User's Guide
This User Gave Thanks to Franklin52 For This Post:
# 7  
Old 08-16-2013
Uff, this tells me that I have to take care when handling upper/lower case issue.

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