Urtica Dioica (Gaultheria Shallon?) wrote:
> The regex in question became somewhat famous after the VimCast at
> http://vimcasts.org/episodes/vimgolf-prime-numbers/
>
> Here's the setup:
>
> C<Tab>1<Esc>qq<C-A>>>Ypq540@q
>
> From here, the following command is used to remove lines with a
> composite number ot tabs:
>
> :g/\v^(<Tab><Tab>+)\1+</d<CR>
>
> On Vim 7.4.91, this regex uses the NFA engine, and fails to match the
> correct number of tabs. When manually switching engines by prepending
> \%#=1 to the regex, it works correctly.
>
> By removing the < at the end of the regex, like this:
>
> \v^(\t\t+)\1+
>
> and searching with 'hlsearch' on, you can see how many tabs are
> matched. The old engine correctly matches the highest composite number
> of tabs possible in each line. The NFA engine matches a number of tabs
> equal to the highest number in: 4, 6, 10, 18, 34, 66, 130, 258, 514.
> What the pattern is, I don't know.
Power of 2 plus 2.
I guess the problem is with using \< at the end of the pattern.
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