Regular Expression - Replace if x contains y except if...

not4google · #1 (**permalink**) 03-04-2009

Hi all,

I have a file which contains 1000s of lines of text. I need to delete all lines with the words "Red" EXCEPT if the line also contains the word "GREEN"...

For example:

ThisIs some random text that should be red deleted
ThisIs some random text that should NOT be red deleted green

In this case the first line should be deleted totally BUT the second line should remain in the file...Any suggestions on this would be appreciated,

jim mcnamara · #2 (**permalink**) 03-04-2009

one way:

Code:

awk ' { if(index($0, "green" )>0)  {print $0; next}
          if(index($0, "red") >0 ) {next}
          print $0
        } ' inputfile > newfile

ce9888 · #3 (**permalink**) 03-04-2009

There is probably a more efficient way to di this...

Code:

while read line
do
     echo $line | grep -i red > /dev/null
     if [ $? -eq 0 ]
     then
         echo $line | grep -i green > /dev/null
         if [ $? -eq 0 ]
         then
              echo $line >> new_file
         fi
     else
         echo $line >> new_file
     fi
done < input_file

ShawnMilo · #4 (**permalink**) 03-04-2009

Code:

 cat temp.txt  | perl -ne 'if(/green/i){print;}else{print unless /red/i} '

radoulov · #5 (**permalink**) 03-04-2009

Code:

awk '/red/&&!/green/{next}1' infile

Or:

Code:

sed '/red/{/green/!d;}' infile

Or:

Code:

perl -ne'print unless/red/&&!/green/' infile

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