Remove duplicate tests in Lib/tests/re

Remove duplicate tests in Lib/tests/re_tests.py

BPO	36528
Nosy	@benjaminp, @ezio-melotti, @serhiy-storchaka, @miss-islington, @tirkarthi, @MakDon
PRs	bpo-36528: Remove duplicate tests #12689 [3.8] bpo-36528: Remove duplicate re tests. (GH-2689) #15986

^{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 2019-09-11.16:05:25.169>
created_at = <Date 2019-04-04.17:29:02.832>
labels = ['expert-regex', '3.8', 'type-bug', 'tests']
title = 'Remove duplicate tests in Lib/tests/re_tests.py'
updated_at = <Date 2019-09-11.16:46:31.726>
user = 'https://github.com/tirkarthi'

bugs.python.org fields:

activity = <Date 2019-09-11.16:46:31.726>
actor = 'miss-islington'
assignee = 'none'
closed = True
closed_date = <Date 2019-09-11.16:05:25.169>
closer = 'benjamin.peterson'
components = ['Regular Expressions', 'Tests']
creation = <Date 2019-04-04.17:29:02.832>
creator = 'xtreak'
dependencies = []
files = []
hgrepos = []
issue_num = 36528
keywords = ['patch']
message_count = 4.0
messages = ['339457', '347307', '351963', '351976']
nosy_count = 7.0
nosy_names = ['benjamin.peterson', 'ezio.melotti', 'mrabarnett', 'serhiy.storchaka', 'miss-islington', 'xtreak', 'makdon']
pr_nums = ['12689', '15986']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36528'
versions = ['Python 3.8']