On 03/22/2011 03:33 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?
The "-" :)
Walk through the substitution sequentially and you'll see what's
happening:
The first line gets changed to "01:00 x", then the 2nd line looks
in the previous line (now containing the "01:00" you just
prepended) and prepends that matching "01:00"...lather, rinse,
repeat.
The following worked for me:
:%s/^/\=substitute(getline(line('.')-1), '^\%(\d\{2}:\d\{2}
\)\=\(\d\{2}:\d\{2} \).*', '\1' ,'g')
-tim
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