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

From: Nicolas Richard
Subject: Re: Is it valid to use the zero-byte "^@" in regexps?
Date: Wed, 18 Jun 2014 11:52:11 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3.91 (gnu/linux)

Thorsten Jolitz <address@hidden> writes:
> 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"
> `--------------------------------------------------------

I don't see why it wouldn't be valid, but I don't know. If it is
desirable is another question : it would be better to search for the
beginning, then search for the end with another regexp.

> If so, this regexp should reliably match any 
> ,-----------------------
> | #+begin_src emacs-lisp
> |  [...]
> | #+end_src
> `-----------------------

>From the first occurrence of
#+begin_src emacs-lisp
;; after point to the last occurence of
in the buffer. If there's more than one, they'll be part of the match
too. e.g. if there's another block in the same document :
#+begin_src sh
echo whatever.
it'll be part of the match too. If you don't want that, make the star
non-greedy by appending a question mark to it:
(re-search-forward "^#\\+begin_src[[:space:address@hidden")

> no matter whats inside the block, right?

Except NUL characters of course.


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