email/quoprimime.py doesn't use re.sub correctly

[umi]

BPO	18380
Nosy	@warsaw, @ezio-melotti, @bitdancer
Files	patch_18380: Fix the call to re.sub to pass flags as a positional argument + test

^{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/ezio-melotti'
closed_at = <Date 2013-07-06.15:19:26.106>
created_at = <Date 2013-07-06.12:32:48.411>
labels = ['expert-regex', 'type-bug', 'library', 'expert-email']
title = "email/quoprimime.py doesn't use re.sub correctly"
updated_at = <Date 2013-07-06.15:19:26.105>
user = 'https://bugs.python.org/umi'

bugs.python.org fields:

activity = <Date 2013-07-06.15:19:26.105>
actor = 'ezio.melotti'
assignee = 'ezio.melotti'
closed = True
closed_date = <Date 2013-07-06.15:19:26.106>
closer = 'ezio.melotti'
components = ['Library (Lib)', 'Regular Expressions', 'email']
creation = <Date 2013-07-06.12:32:48.411>
creator = 'umi'
dependencies = []
files = ['30819']
hgrepos = []
issue_num = 18380
keywords = []
message_count = 4.0
messages = ['192428', '192448', '192451', '192452']
nosy_count = 6.0
nosy_names = ['barry', 'ezio.melotti', 'mrabarnett', 'r.david.murray', 'python-dev', 'umi']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue18380'
versions = ['Python 3.3', 'Python 3.4']

[umi]

header_decode function in the standard library email/quoprimime.py module calls re.sub with a positional argument for flags in the wrong position. My patch fixes it to use a keyword argument.

[umi]

I have updated the patch with a testcase.

[python-dev]

New changeset c8fd1351c840 by Ezio Melotti in branch '3.3':
bpo-18380: pass regex flags to the right argument. Patch by Valentina Mukhamedzhanova.
http://hg.python.org/cpython/rev/c8fd1351c840

New changeset 6e23ce14c3c6 by Ezio Melotti in branch 'default':
bpo-18380: merge with 3.3.
http://hg.python.org/cpython/rev/6e23ce14c3c6

[ezio-melotti]

Fixed, thanks for the patch!