2009/9/17 roger peppe <rogpe...@gmail.com>:
> just change the regexp as required.
Ok. I decided (although just for game now) to play a little with the
idea of building the regexp.
Starting from Eric's post I slowly progressed to sth. quite similar to
your post :) :
fn buildre {
re = 's:^([ ]*)('
for(i in `{seq 1 `{hoc -e $1-1}})
re = $re ^ '[^ ]+[ ]+'
re = $re ^ ')[^ ]+:\1\2' ^ $2:
}
This works (even takes care about leading spaces) unless I want to use
it for the 1st field. Then the produced regexp (buildre 1 hell)is
s:^([ ]*)()[^ ]+:\1\2hell:
and sed says
sed: Command garbled: s:^([ ]*)()[^ ]+:\1\2hell:
Apparently it dislikes the empty group, (). Is there any reason?
I tried it in linux, there with
echo '1 28 3' | sed 's:^\([ ]*\)\(\)[^ ][^
]*:\1\2hell:'
and it works as expected...
Thanks
Ruda
