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# 1  
Old 11-06-2009
sed pattern matching

Unfortunately this chap has been banned for some reason and I was looking forward to the resolution of his question: -

https://www.unix.com/shell-programmin...n-28-33-a.html

He was asking if you can use sed to match a pattern you want to replace within a restricted range of characters in a string. Can anyone tell me how to do this?

He wanted to change: -

Code:
21111111110001343 000001004OLF-AA029100020091112

to: -

Code:
21111111110001343 000001004OLF-1E029100020091112

But I don't want a generic match that matches the whole line, just that range highlighted in blue. Is it possible to do this using sed?
# 2  
Old 11-06-2009
Something like this?

Code:
sed 's/.*\(...-..\).*/\1/'

# 3  
Old 11-06-2009
Quote:
Originally Posted by steadyonabix
Unfortunately this chap has been banned for some reason and I was looking forward to the resolution of his question: -

https://www.unix.com/shell-programmin...n-28-33-a.html

He was asking if you can use sed to match a pattern you want to replace within a restricted range of characters in a string. Can anyone tell me how to do this?

He wanted to change: -

Code:
21111111110001343 000001004OLF-AA029100020091112

to: -

Code:
21111111110001343 000001004OLF-1E029100020091112

But I don't want a generic match that matches the whole line, just that range highlighted in blue. Is it possible to do this using sed?
putting tools to use aside, let's think logically. if you want to replace position 28 to 33, then print from position 1 to 27, then print the new replacement, then print from 34 onwards...
pseudocode:
Code:
print substr(line,1,27) "OLF-1E" substr(line,34)

no need to think of any regex.
# 4  
Old 11-06-2009
But I like regex Smilie
Code:
ssed -r 's/(.{27}).{6}/\1FOO-BR/' infile


Last edited by Scrutinizer; 11-07-2009 at 08:17 PM..
# 5  
Old 11-07-2009
Thanks for the replies but I don't think that they quite do what I am asking for. I want to combine the replacement of the characters within the range while matching the pattern.

So the replacement only occurs if the pattern is present within that specific range of characters.
# 6  
Old 11-07-2009
Hi steady, you mean something like this?
Code:
sed -r 's/(.{27})OLF-AA/\1OLF-1E/;s/(.{27})ODL-SP/\1ODL-2S/;s/(.{27})ODL-CH/\1ODL-3C/' infile


Last edited by Scrutinizer; 11-07-2009 at 08:37 PM..
# 7  
Old 11-08-2009
That's the one, thanks! Smilie

Knew it could be done......

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