On Mar 22, 2011, at 3:33 PM, Dennis Benzinger wrote:
> Hi!
>
> I have a log file with timestamps and messages:
>
> 01:00 x
> 02:00 y
> 03:00 z
>
> To compare the time elapsed between two events I want to prefix each line
> with the timestamp of the previous time. I tried to use
>
> %s/^/\=matchstr(getline(line(".")-1), "\\d\\{2}:\\d\\{2} ")
>
> but somehow the first match is prepended to every line:
>
> 01:00 x
> 01:00 02:00 y
> 01:00 03:00 z
>
> A larger example would be the file
>
> http://www.rfc-editor.org/in-notes/rfc-index.txt
>
> with the command
>
> %s/^/\=matchstr(getline(line(".")-1), "\\d\\{4} ")
>
> The first match 1129 from line 24 is prepended to every following line.
>
>
> Where is the problem?
When you substitute line 3, it gets the first time stamp if finds in line 2, so
I modified line 1 and search pattern like this:
00:00 01:00 x
02:00 y
03:00 z
:%s/^/\=matchstr(getline(line(".")-1), '\d\{2}:\d\{2} \zs\d\{2}:\d\{2} ')
And it seems to work.
Israel
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