Ken Hamada wrote:

> Hi list, I noticed that E16 occurs with regexp.
> 
> set re=1
> echo '' =~# '[\uff-\uf0]'
> E16: Invalid range
> echo '' =~# '[\u3000-\u4000]'
> E16: Invalid range
> 
> I think this is unintuitive error message because E16 reminds us the range of
> commands (for example :0buffer). So I suggest two exclusive options:
> 
> - Add a note that the error can occur with regexp at :h E16.
> - Change the error message and number.

>From the old days a bit of memory was saved by limiting the number of
error messages.  Now that we are more interested in useful errors,
splitting off specific cases is useful.

> BTW the behaviour *Limit to a range of 256 chars* differs due to the
> regex engine version.
> I could not tell the difference until I dived into the source code. I
> would like some warning to be written regarding this topic around :h
> /[.

I thought this was mentioned somewhere, but can't find it right now.
Please suggest an improvement.

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