Re: why %s/b//gn doesn't work?

在 2016年5月7日星期六 UTC+8上午10:53:10，Tim Chase写道：
> On 2016-05-06 19:19, 李哲 wrote:
> > If I want to replace the `b` letter in the text with `null` and I
> > also want to get the match number.
> >
> > so I use the command `%s/b//gn` , but I just get the count number
> > but the `b` letter hasn't been replaced.
> >
> > If I use %s/b/a/gn it worked.
>
> I get the same behavior in both cases (because of the /n flag,
> neither actually performs the replacement. I recall there was a
> patch that performed evaluations of the replacement in the case it
> was a "\=" (sub-replace-special), but didn't actually replace the
> text. I'd have to go digging for info to exactly which version/patch
> that went into. Which version/patch-level are you currently running?
>
> > I want to delete the `b` letter and the know the count number mean
> > time . What should I do?
>
> By default, Vim should report the count of changes if it exceeds your
> 'report' setting. Try
>
> :set report=0
>
> and re-try the command without the /n flag. If I understand what you
> want, this should do the trick. If not, please clarify what you want
> that isn't happening.
>
> -tim

tnx a lot for you reply but I get a little confused about the word `evaluations`, what is the meaning here about it?

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