Fix documentation examples of using re with escape sequences

[csabella]

BPO	32614
Nosy	@terryjreedy, @serhiy-storchaka, @csabella
PRs	bpo-32614: Modify re examples to use a raw string to prevent warning #5265 [3.7] bpo-32614: Modify re examples to use a raw string to prevent warning (GH-5265) #5499 [3.6] bpo-32614: Modify re examples to use a raw string to prevent wa… …rning (GH-5265) #5500

^{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 = 'https://github.com/terryjreedy'
closed_at = <Date 2018-02-02.22:38:37.658>
created_at = <Date 2018-01-21.22:47:38.767>
labels = ['3.8', 'type-feature', '3.7', 'docs']
title = 'Fix documentation examples of using re with escape sequences'
updated_at = <Date 2018-02-02.22:38:37.657>
user = 'https://github.com/csabella'

bugs.python.org fields:

activity = <Date 2018-02-02.22:38:37.657>
actor = 'terry.reedy'
assignee = 'terry.reedy'
closed = True
closed_date = <Date 2018-02-02.22:38:37.658>
closer = 'terry.reedy'
components = ['Documentation']
creation = <Date 2018-01-21.22:47:38.767>
creator = 'cheryl.sabella'
dependencies = []
files = []
hgrepos = []
issue_num = 32614
keywords = ['patch']
message_count = 5.0
messages = ['310386', '310807', '311516', '311517', '311519']
nosy_count = 4.0
nosy_names = ['terry.reedy', 'docs@python', 'serhiy.storchaka', 'cheryl.sabella']
pr_nums = ['5265', '5499', '5500']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue32614'
versions = ['Python 3.6', 'Python 3.7', 'Python 3.8']

[csabella]

If a documentation example would produce a DeprecationWarning for an invalid escape sequence, change the example to use a raw string.

[terryjreedy]

Definitely. x.y code, including doc examples, should free of such warnings.

[terryjreedy]

New changeset 6677142 by Terry Jan Reedy (Cheryl Sabella) in branch 'master':
bpo-32614: Modify re examples to use a raw string to prevent warning (GH-5265)
6677142

[terryjreedy]

New changeset c7de1d7 by Terry Jan Reedy (Miss Islington (bot)) in branch '3.7':
bpo-32614: Modify re examples to use a raw string to prevent warning (GH-5265) (bpo-5499)
c7de1d7

[terryjreedy]

New changeset fbf8e82 by Terry Jan Reedy in branch '3.6':
[3.6] bpo-32614: Modify re examples to use a raw string to prevent wa… …rning (GH-5265) (GH-5500)
fbf8e82