RE: How to find and replace using negative lookahead

Hi, thanks for your quickly answer. I never noted that negative lookahead is a zero-string match and that I had to put again the string that I want to change (the four digits). Your solution works very fine.

Regards,

César V.

Date: Fri, 8 Jun 2012 01:11:25 -0700

From: [hidden email]
To: [hidden email]
Subject: RE: How to find and replace using negative lookahead

César Valencia wrote:

> Hi, I want to find all the strings the has "K Value=" not
> followed by 0000 and replace them for "K Value=1300".
> This is my original text:
>
> K Value=0010, P Value=1025, Z Value=2000
> K Value=2051, P Value=0310, Z Value=5110
> K Value=0000, P Value=5025, Z Value=9000
>
> and the result should be:
>
> K Value=1300, P Value=1025, Z Value=2000
> K Value=1300, P Value=0310, Z Value=5110
> K Value=0000, P Value=5025, Z Value=9000

I would try a negative lookahead, like this:

:%s/K Value=\%(0000\)\@!\zs\d\{4}/1300/g

That finds "K Value=" not followed by "0000" but followed by
four digits. It then changes the four digits to "1300".

Not tested much!

John

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