Re: Using ^ (match start of line) and \% (match column) together

2016-06-07 22:45 GMT+03:00 Nicola <nvitacolonna@gmail.com>:
> The following patterns both match up to column 17 included:
>
> /.*\%17v
> /.*\%17v.
>
> If ^ is added, the two are no more equivalent:
>
> /^.*\%17v <-- matches up to column 16
> /^.*\%17v. <-- matches up to column 17

You are treating this wrong. First original patterns matches up to
column 16 (inclusive) *and* has a zero-width match after column 16
which (as any other zero-width match) makes &hlsearch highlight column
17. Second original pattern matches up to column 17 (inclusive).

I.e. first original pattern has *two* matches (one of which uses the
fact that `.*` may match zero characters), second has *one*. Putting
`^` at the start rejects one of the matches.

In any case *do not use &hlsearch as the **only** instrument to
determine where is the match*. You cannot distinguish two consequtive
patterns with one, you also cannot say whether pattern matched some
character or it has zero-width match at some position. There are also
other tools: `:s` with `\=` and `submatch()`, `match*()` functions
family, `n`/`N` normal-mode commands. Though it may be a bug that `n`
can jump to that zero-width match, but `:%s//\=Echo(submatch(0))/gn`
shows only the first one (`function Echo(str)|echomsg
string(a:str)|endfunction`).

>
> Is this a bug?
>
> Seeing this with Vim 7.4 1-1864.
>
> Nicola
>
>
> --
> --
> 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 vim_use+unsubscribe@googlegroups.com.
> For more options, visit https://groups.google.com/d/optout.

--
--
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 vim_use+unsubscribe@googlegroups.com.
For more options, visit https://groups.google.com/d/optout.