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Old 08-03-2007, 12:15 AM   #1
6millionbucks
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How to replace all occurances of a complex string using sed


Can someone tell me what Im doing wrong. Im trying to replace all occurances of one string with another string.

I want to replace all occurances of downloads/index.php?folder/200706/ with dwnld/new_index.php?p= in a file called va_200706.php

I've tried the following:

Code:
cat va_200706.php | sed 's/\downloads/index.php?folder/virginia/200706/\/\dwnld/dl.php?p=\/g' > va_200706_new.php
as well as

Code:
cat va_200706.php | sed 's/[downloads/index.php?folder/virginia/200706/]/[dwnld/dl.php?p=]/g' > va_200706_new.php
There was a similiar question posted in which the solution was to use

sed s/SEARCHSTRING/REPLACESTRING/g

but I think the / in my strings are messing things up.
 
Old 08-03-2007, 12:23 AM   #2
rkelsen
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Quote:
Originally Posted by 6millionbucks
but I think the / in my strings are messing things up.
You need to 'escape' special characters with backslashes.

Eg:

Code:
sed 's/downloads\/index.php\?folder\/200706\//dwnld\/new_index\.php\?p\=/'
 
Old 08-03-2007, 12:29 AM   #3
syg00
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And you don't even need to escape the "?" if IIRC. (or the "=" ???).
 
Old 08-03-2007, 12:35 AM   #4
6millionbucks
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SOLVED: how to replace all occurances of a complex string

Thanks rkelsen, the backslashes did it.

Heres what I ended up using and it worked wonderfully:

Code:
sed 's\downloads/index.php?folder/virginia/200706\dwnld/dl.php?p=\g' <va_200706.php >va_200706_new.php
 
Old 08-12-2007, 11:45 AM   #5
archtoad6
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I would have written that as:
Code:
sed 's,downloads/index.php?folder/virginia/200706,dwnld/dl.php?p=,g' <va_200706.php >va_200706_new.php
The principle is the same: the 1st character after the 's' is the regex delimiter. AFAIK, any character may be chosen. I think using '\' is not desirable because then it cannot be used in its normal "escape character" role.

I have come to prefer ',' as my personal standard delimiter, but I have friends who use '!' or '#'. It's a matter of taste.

Although you would not want to use it here because it would require escaping the '?', you might also want to add the sed "-r" to your repertoire -- see the man page.
 
Old 08-12-2007, 11:55 AM   #6
/bin/bash
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Also sed can edit the file directly using -i switch and will even make a backup copy.
Code:
sed -i.bak 's\downloads/index.php?folder/virginia/200706\dwnld/dl.php?p=\g' va_200706.php
The above edits the file va_200706.php and creates backup file va_200706.php.bak

Last edited by /bin/bash; 08-12-2007 at 11:59 AM.
 
Old 08-12-2007, 11:55 AM   #7
/bin/bash
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oops too many clicks

Last edited by /bin/bash; 08-12-2007 at 11:56 AM. Reason: oops too many clicks
 
  


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