Message-ID: <CABxs9VnTdeQU0bUZM6DeZKRx0H+B=gAwquGwpunbz6rg=csUsA@mail.gmail.com>
Date: 2013-07-27T13:10:20Z
From: Liviu Andronic
Subject: list of valid characters in object names
In-Reply-To: <51F3C64B.9080501@gmail.com>
On Sat, Jul 27, 2013 at 3:08 PM, Duncan Murdoch
<murdoch.duncan at gmail.com> wrote:
> Your question is a little ambiguous. All characters are allowed in object
> names, but the parser will only recognize some of them if they are quoted in
> backticks.
>
> The ones it recognizes without the backticks are ones that the C isalnum()
> (or iswalnum()) function declares to be alphanumeric, plus . and _. Your
> list above are all allowed, but locales are allowed to declare other
> characters to be alpha. I wouldn't recommend using anything else, because
> your code won't be recognized in other locales.
>
> The definitive reference for this is the source code, specifically
> src/main/gram.y. There's some discussion in the Intro to R manual, section
> 1.8.
>
Exactly what I was looking for. Thank you,
Liviu