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Old 02-20-2009, 05:35 AM   #1
anjanesh
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sed: pattern matching with newlines


Hi

How do I get sed to read patterns within newlines ?

Code:
sed -i 's|hello.*?world|just-hello|g' *.txt
sed -i 's|hello.*?\n.*?world|just-hello|g' *.txt
Thanks
 
Old 02-20-2009, 06:31 AM   #2
jschiwal
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You need to build up more than one line in either the pattern space or the hold space. Then have commands that use `\n' for the newline. The $ metacharacter will match the end of the buffer and not an embedded newline.

Use the N command to append to the pattern space, and H to append to the hold space.

Code:
cat testfile.txt
Hello World.
Hello
World.

Hello cruel world.
Code:
sed '/Hello/{ s/Hello World/Just Hello/;t
                               N;/Hello\nWorld/{N;s//Just\nHello/}
                             }' testfile.txt
Just Hello.
Just
Hello.

Hello cruel world.

Last edited by jschiwal; 02-20-2009 at 06:32 AM.
 
Old 02-20-2009, 06:36 AM   #3
syg00
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Or maybe use a tool better designed for the task - perl, or even awk.
 
  


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