[issue27030] Remove deprecated re features

[Roundup Robot]

Roundup Robot added the comment:

New changeset 1b162d6e3d01 by Serhiy Storchaka in branch '3.6':
Issue #27030: Unknown escapes in re.sub() replacement template are allowed
https://hg.python.org/cpython/rev/1b162d6e3d01

New changeset 5904d2ced3d8 by Serhiy Storchaka in branch 'default':
Merge documentation for issue #27030 from 3.6.
https://hg.python.org/cpython/rev/5904d2ced3d8

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<http://bugs.python.org/issue27030>
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