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awk: string followed by tab comparision

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# 1  
Old 01-30-2012
awk: string followed by tab comparision
Hi all,
Currently i am using

Code:
if( $0~/ NOT / && $0~/ NULL /)
{
  .................            
}

to check if the input record contains "NOT" and "NULL". But in some cases "NOT" and "NULL" are preceded and followed by tab. How do i find compare for these fields as well?
# 2  
Old 01-30-2012
Just remove the space...
Code:
if(/NOT/ && /NULL/)
{
...
}

You can also avoid "$0~" since by default it will check again $0.

--ahamed
# 3  
Old 01-30-2012
Try this. This will handle any whitespace (space or tab) before and after NOT and NULL
Code:
echo -e "abc\tNOT\tNULL\txyz" |  awk '/[ \t]NOT[ \t]/&&/[ \t]NULL[ \t]/{print "found"}'

Last edited by chihung; 01-30-2012 at 08:30 PM..
# 4  
Old 01-31-2012
Code:
 
awk '/NOT.*NULL/' input.txt

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