[O] org-block-regexp questions

[Marcin Borkowski]

Hi list,

I'm studying org-block-regexp.  One thing that bugs me is this part:

#\\+begin_?

It suggests to me that the underscore after "begin" might be optional;
but a quick experiment with the exporter shows that this is not the
case.

Next, this part:

\\([^ \n]+\\)

would suggest that TAB is a valid part of the name of the block.
Strange, isn't it?

Finally, the rationale behind

\\(\\([^\n]+\\)\\)?

escapes me completely.  What's the use of groups nested like this?

Any ideas?

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