Is it valid to use the zero-byte "^@" in regexps?

[Thorsten Jolitz]

Hi List, 

when matching multi-line text, using the negated zero-byte in a regexp
is convenient to match *any* chararcter, since it should only appear in
binary files not in text files. 

However, I sometimes get strange and a bit unpredictable results using
this technique. 

To rule out a fundamental problem - is it valid to have the zero-byte
(inserted with C-q C-@) appear in a regexp like this? 

,--------------------------------------------------------
| "^#\\+begin_src[[:space:]]+emacs-lisp[^^@]*\n#\\+end_src"
`--------------------------------------------------------

If so, this regexp should reliably match any 

,-----------------------
| #+begin_src emacs-lisp
|  [...]
| #+end_src
`-----------------------

no matter whats inside the block, right?

-- 
cheers,
Thorsten