[3.6] bpo-32614: Modify re examples to use a raw string to prevent wa… …rning (GH-5265) #5500
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Modify RE examples in documentation to use raw strings to prevent DeprecationWarning.
Add text to REGEX HOWTO to highlight the deprecation. Approved by Serhiy Storchaka..
(cherry picked from commit 6677142)
https://bugs.python.org/issue32614