Thanks to all who replied to my thread!

On Sun, 20 Dec 2020 at 17:30, Tim Chase <v...@tim.thechases.com> wrote:
>
> On 2020-12-20 11:09, A. Wik wrote:
> > Browsing a directory listing, sometimes I hit lines like these:
> > ./spool/exim/input/1FM8sl-00004n-Ix-H
> > ./spool/exim/input/1FM8sn-00004u-OF-D
> > ./spool/exim/input/1E9dsQ-00004f-MO-D
> > [... thousands of similar lines ...]
> >
> > How can I use "/" to find the next line not matching the above
> > pattern?  I've tried the following (and several variations):
> > /\(.*exim.input\)\@<!.*
>
> you can use which only finds the start of the line:
>
>    /^\%(.*exim.input\)\@!
>
> or if you want to match the entire line, you can use:
>
>   /^\%(\%(exim.input\)\@!.\)*$/
>
> That breaks down to
>
>   ^          from the start of the line
>   \%(…\)*    zero or more of these things
>    \%(exim.match\)\@!   at each of these places, this can't match
>    .                    accept a character here
>   $          all the way to the end of the line
>              (no partial line matches, or it would find
>              ".spool/exim/inpu" (because "exim.input" doesn't yet
>              match)

Can you clarify the function of the dot?  It appears that without it,
it finds only empty lines.  With it, it finds any line not matching
"exim.input", including empty lines.

-aw

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