Re: Scan of regexps in Emacs (March 17)

[Stefan Monnier]

> (string-match "\xff"     "\xff")  => 0
> (string-match "[\xff]"   "\xff")  => 0
> (string-match "\xffé?"   "\xff")  => nil
> (string-match "[\xff]é?" "\xff")  => 0
> (string-match "\xff"     "\xffé") => 0
> (string-match "[\xff]"   "\xffé") => nil
> (string-match "\xffé?"   "\xffé") => 0
> (string-match "[\xff]é?" "\xffé") => nil

Check (multibyte-string-p "...") on those strings, to see some of the
reasons why.  IIRC the treatment of those escape sequences to determine
unibyte/multibyte strings is pretty tricky (last time I looked at it,
I found its behavior to be undesirable, but I believe it has slightly
changed since and I can't remember what were the problems I bumped
into).


        Stefan