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

From: Thorsten Jolitz
Subject: Is it valid to use the zero-byte "^@" in regexps?
Date: Wed, 18 Jun 2014 11:14:06 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

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:address@hidden"

If so, this regexp should reliably match any 

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

no matter whats inside the block, right?


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