Re: Fancy C/C++ Code Coloring: Useable but too slow for large buffers. Wanted: Optimization!

[Nikolaj Schumacher <n_schumacher@web.de>]

Nordlöw <per.nordlow@gmail.com> wrote:

> (defun regexp-quote-alt-list (list)
>   "Return a regexp string which exactly matches any of the
> elements (alternatives) in the LIST of strings."
>   (interactive)
>   (mapconcat 'regexp-quote list "\\|"))

I didn't read much further, but you should use `regexp-opt' instead.
It's a pretty smart function.

Using your own example:

(regexp-quote-alt-list '("*a" "*b" "*c"))
-> "\\*a\\|\\*b\\|\\*c"

(regexp-opt '("*a" "*b" "*c"))
-> "\\*[abc]"



regards,
Nikolaj Schumacher