[docs] [issue22594] Add a link to the regex module in re documentation

[Marco Buttu]

Marco Buttu added the comment:

> With the VERSION0 flag (the default behaviour), it should
> behave the same as the re module, and that's not going to change.

Thanks for the clarification Matthew. However, the default version will change, as the regex PyPI page points out: "In the short term this will be VERSION0, but in the longer term it will be VERSION1." I propose a patch that integrates the Brett suggestion.

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Added file: http://bugs.python.org/file46575/regex_reference.patch

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