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awk regex expression works in AIX but not in Linux

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# 1  
Old 07-28-2014
awk regex expression works in AIX but not in Linux
I have following expression:
Code:
echo "Sun 12 Jul BST 2014\nSun 12 Jul 2014\nSun 12 Jul IS 2014" | awk '/(Sun)+( 12)+( Jul )+([A-Z]{3} )?(2014)/{print;}'

I ran above code in AIX box and output is as follows
Code:
Sun 12 Jul BST 2014
Sun 12 Jul 2014


I ran above code in Linux box and output is as follows
Code:
Sun 12 Jul 2014

What I am missing?
Is there something not according to POSIX standards.

Linux Box Detail
Code:
>uname -a
Linux ****** 2.6.18-348.3.1.el5 #1 SMP Tue Mar 5 13:19:32 EST 2013 x86_64 x86_64 x86_64 GNU/Linux


AIX box detail
Code:
# uname -a
AIX ****** 1 6 00F63E7C4C00

# 2  
Old 07-28-2014
I get this on my Linux box, the results are actually the same, my linux system just doesn't do an actually process the new line...but the results are the same.
Code:
[josephgr@oc0887178221 ~]$ echo "Sun 12 Jul BST 2014\nSun 12 Jul 2014\nSun 12 Jul IS 2014" | awk '/(Sun)+( 12)+( Jul )+([A-Z]{3} )?(2014)/{print;}'
Sun 12 Jul BST 2014\nSun 12 Jul 2014\nSun 12 Jul IS 2014

When I do this; however, on linux...
Code:
$ echo -e "Sun 12 Jul BST 2014 \n Sun 12 Jul 2014 \n Sun 12 Jul IS 2014" | awk '/(Sun)+( 12)+( Jul )+([A-Z]{3} )?(2014)/{print}'
 Sun 12 Jul 2014

-E is the default for echo on linux and that means "disable interpretation of backslash escapes"

Code:
$ uname -a
Linux oc0887178221.ibm.com 2.6.32-431.21.1.el6.x86_64 #1 SMP Tue Jun 3 19:11:40 EDT 2014 x86_64 x86_64 x86_64 GNU/Linux

# 3  
Old 07-28-2014
What's your awk version? Some Linuxes use mawk which doesn't recognize the extended regex [A-Z]{3}. And, use echo -e to have the "\n" interpreted correctly.
This User Gave Thanks to RudiC For This Post:
Corona688
# 4  
Old 07-28-2014
Most awk on Linux do not recognize [A-Z]{3} which is called an interval expression, but it can be enabled like so:

Code:
echo -e "Sun 12 Jul BST 2014\nSun 12 Jul 2014\nSun 12 Jul IS 2014" | awk --re-interval '/(Sun)+( 12)+( Jul )+([A-Z]{3} )?(2014)/{print;}'
Sun 12 Jul BST 2014
Sun 12 Jul 2014

From man page:

Code:
--re-interval Enable the use of interval expressions in regular expression matching (see Regular Expressions, below). 
Interval expressions were not traditionally available in the AWK language. The POSIX standard added them, to make awk 
and egrep consistent with each other. However, their use is likely to break old AWK programs, so gawk only provides 
them if they are requested with this option, or when --posix is specified.

# 5  
Old 07-28-2014
Thanks in2nix4life, answer is specific one....
I got the point.

But is there any other way to handle interval expression so that it will work in my AIX and Linux version both.

Because
Code:
[A-Z]{3}

is an basic functionality, hence there must be something else which can replace it in my Linux version.
# 6  
Old 07-28-2014
What's wrong with --re-interval ? It does exactly what you want...

You could also use --posix...

Also, "echo -e" is not crossplatform. Use "printf" to get consistent behavior.

Code:
printf "%s\n" "line1" "line2"

# 7  
Old 07-28-2014
Simplest solution... Wrap your awk command in a script and detect which OS the script is being executed on and run the correct awk command. Smilie
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