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Full Discussion: sed pattern matching
Top Forums Shell Programming and Scripting sed pattern matching Post 302369193 by ghostdog74 on Friday 6th of November 2009 09:29:36 PM
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.
 

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