[docs] [issue10875] Update Regular Expression HOWTO

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

I applied patch to 3.2, 3.1 in r87904, r87905. Thanks.
I had to re-edit for 2.7: r87909.

I made a separate small patch for my suggested addition to Matching Characters. Could someone check that it is correct, given that re.rst contains the target directive (or whatever it is called):
.. _re-syntax:

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assignee: docs at python -> terry.reedy
stage: needs patch -> commit review
Added file: http://bugs.python.org/file20340/zregex2.rst.diff

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