Hi all, On Wed, 13 Oct 2021 at 14:36, Tim Chase <[email protected]> wrote: > > On 2021-10-11 23:45, A. Wik wrote: > > > 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. > > Sorry for the late reply. The "." is what lets the regex move > forward, roughly stating ".*" but at each of those "." locations, > before we accept that location, we assert that "exim.match" can't > match at that particular character. > > this line contains exim match here > > when the regex engine gets to the "e" in "exim match", the \@! > assertion fails, so the regex doesn't match that line, but on a line > like > > hello > > it starts at the beginning. /exim.match/ doesn't match there so the > "." accepts the "h", moving to the next char. /exim.match/ doesn't > match there either, so the "." accepts the "e". Repeat until it gets > to the end, having asserted that each ".", no /exim.match/ exists. > > Hope that helps make a bit of sense of it?
Yes, I think so. Is it because \@! is zero-width that it must be paired with something (eg. ".") that does have width? And it matches an empty line because of the \%( ... \)*? -aw -- -- You received this message from the "vim_use" maillist. Do not top-post! Type your reply below the text you are replying to. For more information, visit http://www.vim.org/maillist.php --- You received this message because you are subscribed to the Google Groups "vim_use" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/vim_use/CALPW7mTVWaRd026iULVbQXbnPbhBKOtymcz_NiHP4NPPbk_ptA%40mail.gmail.com.
