how do I negate a sed match

muxman · #1 (**permalink**) 09-29-2006

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?

anbu23 · #2 (**permalink**) 09-29-2006

Code:

sed "/http:\/\/www.google.com/!d" file

! - negate the match

muxman · #3 (**permalink**) 09-29-2006

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.

anbu23 · #4 (**permalink**) 09-29-2006

can you show some example?

ghostdog74 · #5 (**permalink**) 09-29-2006

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'

Jebbur · #6 (**permalink**) 10-04-2006

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
$

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
How to negate grep result?	mmdawg	Shell Programming and Scripting	4	05-05-2008 09:24 AM
dynamic match thru awk	manas_ranjan	UNIX for Advanced & Expert Users	23	08-31-2007 05:13 AM
negate * with in pattren matching...	pbsrinivas	Shell Programming and Scripting	7	06-11-2007 10:30 AM
How to match month	Nayanajith	Shell Programming and Scripting	1	06-27-2006 02:55 AM
record match	pavan_test	UNIX for Dummies Questions & Answers	1	01-27-2006 10:41 PM

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes	Rate This Thread
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode	Rate This Thread:


	Powered by