Re: What's the best way to do "string-memq"?

[Kevin Rodgers <kevin.d.rodgers@gmail.com>]

Alan Mackenzie wrote:
> Hi, everybody,
> 
> I need a predicate which I'd ideally like to write as
> 
>     (string-memq (char-after) skip-chars)
> 
> , where skip-chars is a string like "^;{}?:", and the predicate should
> return t when (char-after) is one of (?^ ?\; ?\{ ?\} ?\? ?\:).
> 
> I can't see a convenient way to code this (no, I haven't looked into CL,
> and don't want to).  Isn't there some elisp function something like
> C's strchr?  Or must I dissect the string into its component characters
> for a memq, or (almost as bad), regexp-quote the character from the
> buffer and do `string-match' with that?

How about: (looking-at (format "[%s]" skip-chars))

The only problem is that '^' is special within "[...]", as are ']' and
'-' (see the Regexp Special node of the Emacs Lisp manual).

Or perhaps:

(save-excursion
   (> (skip-chars-forward skip-chars) 0))

In skip-chars-forward (and -backward) `^' is still special within
"[...]", but it can be quoted with `\'.

-- 
Kevin Rodgers
Denver, Colorado, USA