Improve regular expression HOWTO

[joshuarli]

BPO	32913
Nosy	@brettcannon, @joshuarli
PRs	bpo-32913: Added re.Match.groupdict example to regex HOWTO #5821

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-04-18.17:25:26.639>
created_at = <Date 2018-02-22.20:10:00.767>
labels = ['type-feature', 'docs']
title = 'Improve regular expression HOWTO'
updated_at = <Date 2019-04-18.17:25:26.638>
user = 'https://github.com/JoshuaRLi'

bugs.python.org fields:

activity = <Date 2019-04-18.17:25:26.638>
actor = 'brett.cannon'
assignee = 'docs@python'
closed = True
closed_date = <Date 2019-04-18.17:25:26.639>
closer = 'brett.cannon'
components = ['Documentation']
creation = <Date 2018-02-22.20:10:00.767>
creator = 'JoshuaRLi'
dependencies = []
files = []
hgrepos = []
issue_num = 32913
keywords = ['patch']
message_count = 2.0
messages = ['312592', '340454']
nosy_count = 3.0
nosy_names = ['brett.cannon', 'docs@python', 'JoshuaRLi']
pr_nums = ['5821']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue32913'
versions = []

[joshuarli]

"Python HOWTOs are documents that cover a single, specific topic, and attempt to cover it fairly completely."

It would be quite helpful if the section "non-capturing-and-named-groups" in the regex HOWTO contained at least a mention and short usage example of the re.match.groupdict method, something I have found to be pythonic and useful, yet it does not appear frequently in the docs.

I will be submitting a PR for this.

[brettcannon]

New changeset a6de52c by Brett Cannon (josh) in branch 'master':
bpo-32913: Added re.Match.groupdict example to regex HOWTO (GH-5821)
a6de52c