Re: Making re-search-forward search for \377

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

Tyler Spivey wrote:
> Xah <xahlee@gmail.com> writes:
> 
>> what's the C-q 377 char?
>>
>> if i press Ctrl+q 377 Enter, i get this char: ÿ, which is LATIN SMALL
>> LETTER Y WITH DIAERESIS (unicode U+00FF).
>>
>> Then if i do:
>>
>> (re-search-forward "ÿ")
>>
>> it works perfectly.
>>
>> as far as my experience goes, the ease of programing with unicode in
>> elisp beats Perl and Python hands down...
> 
> I'm probably going to end up working with binary data in a temp
> buffer. Doing more research, I want enable-multibyte-characters to be
> off. Given that, if we go to *scratch*
> and run M-X toggle-enable-multibyte-characters until that variable
> becomes nil, doing C-Q 377 RET gives 0xff, which is what I want
> (according to C-x =, C-u C-x = and M-x describe-char). Now to
> match it, I try:
> 
> (re-search-forward "\xff") - no luck
> 
> What did you use to figure out that the multibyte version of that
> character was 0x00FF? I found it out accidentally as a lisp error, but
> none of the previously described commands (C-X =, M-X describe-char or
> C-u C-x =) will show that it is 0x00ff, they just show FF.

`C-u C-x =' shows this:

   character: ÿ (2303, #o4377, #x8ff, U+00FF)

-- 
Kevin Rodgers
Denver, Colorado, USA