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  #1 (permalink)  
Old 09-29-2006
muxman muxman is offline
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how do I negate a sed match

I have a text file that has links in it.

I can write a match for sed to replace the link with anything.

For example:
Code:
http://www.google.com 
becomes
XxX
But what I'm after is not to replace the link with something but to remove everything else and just leave the link. I want a negative match. So that everything that matches is left alone but all non-matching text is removed.

Any ideas?
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Old 09-29-2006
anbu23 anbu23 is offline Forum Advisor  
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Location: Bangalore,India
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Code:
sed "/http:\/\/www.google.com/!d" file
! - negate the match
  #3 (permalink)  
Old 09-29-2006
muxman muxman is offline
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Quote:
Originally Posted by anbu23
Code:
sed "/http:\/\/www.google.com/!d" file
! - negate the match
That deletes the match. What I'm after is to negate it. Instead of replacing the match, replace EVERYTHING ELSE and leave the match alone.
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Old 09-29-2006
anbu23 anbu23 is offline Forum Advisor  
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can you show some example?
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Old 09-29-2006
ghostdog74 ghostdog74 is offline Forum Advisor  
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Quote:
Originally Posted by muxman
That deletes the match. What I'm after is to negate it. Instead of replacing the match, replace EVERYTHING ELSE and leave the match alone.
Alternative in Python:
Code:
#!/usr/bin/python
all = open("file1.txt").read()
allwords = all.split()
for i in range(0,len(allwords)):
	if not "http://www.google.com" in allwords[i]:
 		allwords[i] = "xXx"
print ' '.join(allwords)
Output:
Code:
'xXx xXx http://www.google.com xXx xXx xXx'
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Old 10-04-2006
Jebbur Jebbur is offline
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use the -n option of sed, for example:

sample file link.txt contains:
text
http://www.google.com
text
http://www.unix.com
last line

filter file link.flt contains:
1,$ {
/http:\/\// {
p
}
}

$ sed -n -f link.flt link.txt
http://www.google.com
http://www.unix.com
$
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