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Thanks RudiC, Corona,

Thanks in2nix4life solution is only and simplest solution i got for this after many googling.


Summary for others to help in future.

Simplest solution is to detect...

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...

I have following expression:
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...