[docs] [issue31714] Improve re documentation

Ezio Melotti report at bugs.python.org
Fri Oct 6 11:19:35 EDT 2017

Ezio Melotti <ezio.melotti at gmail.com> added the comment:

ISTM that ``x`` is used when x is a regex or regex metachar, whereas ``'x'`` is used when 'x' is a string.  I find this distinction reasonable.


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