[docs] [issue10875] Update Regular Expression HOWTO

[Éric Araujo]

Éric Araujo <merwok at netwok.org> added the comment:

Looks good, builds without warnings.

Note that you can use :ref:`re-syntax` and Sphinx will substitute the heading for you.  The :role:`some special text <real-target>` form is used when you want to control the text of the link.

(That thing is called an hyperlink target: http://docutils.sourceforge.net/docs/user/rst/quickref.html#hyperlink-targets)

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