> Is there any way to find two specific items of an ascii table of the
> same column but of two adjacent rows ?
I'm not quite sure what you're trying to do on the data you
described in your 2nd posting, so I'm divining intent as well as
a solution. Perhaps with your intent as well, a better solution
can be found.
In the past, I've done things like
/^\%(.\{25}\)\(.\).*\n\%(.\{25}\)\1
to find places where character 26 on one line is the same as
character 26 on the next line. Or, I've used
/^\(\w\+\).*\n\1
to find lines that begin with the same word. If you're looking
for different characters ("A" and "Z") at a particular offset
(26), you can use
/^\%(.\{25}\)A.*\n\%(.\{25}\)Z
It does require that you know the offset though.
If your lines are fixed length (which it sounds like they might
not be, as they have file-names which can be arbitrary lengths),
you might be able to do something like
/^.\{-}A\_.\{129}Z
assuming there are 128 characters in each of your lines (the
129th is the \n character). If you right-padded your file so
that it had a consistent length in each line, this solution might
work for you.
Just a few ideas that have worked for me in the past, doing
something somewhat like I understand you to be describing :)
HTH,
-tim
