[issue21977] In the re's token example OP and SKIP regexes can be improved

[Roundup Robot]

Roundup Robot added the comment:

New changeset bb28542af060 by Raymond Hettinger in branch '3.4':
Issue 21977:  Minor improvements to the regexes in the tokenizer example.
http://hg.python.org/cpython/rev/bb28542af060

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nosy: +python-dev

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<http://bugs.python.org/issue21977>
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