[issue30004] in regex-howto, improve example on grouping

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

Thank you Cristian for reporting this issue. Thank you Mandeep for your patch. Thank you Mariatta for merging.

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<https://bugs.python.org/issue30004>
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