[docs] [issue15920] make howto/regex.rst doctests pass

[Roundup Robot]

Roundup Robot added the comment:

New changeset f98f46f7f11b by Ezio Melotti in branch '3.2':
#15920: fix doctests in Doc/howto/regex.rst.  Patch by Chris Jerdonek.
http://hg.python.org/cpython/rev/f98f46f7f11b

New changeset ef44e1b740cb by Ezio Melotti in branch 'default':
#15920: merge with 3.2.
http://hg.python.org/cpython/rev/ef44e1b740cb

New changeset 19601d451d4c by Ezio Melotti in branch '2.7':
#15920: fix doctests in Doc/howto/regex.rst.  Patch by Chris Jerdonek.
http://hg.python.org/cpython/rev/19601d451d4c

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nosy: +python-dev

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<http://bugs.python.org/issue15920>
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