encoded_word regular expression in email.header.decode_header()

[tkikuchi]

BPO	9967
Nosy	@warsaw, @bitdancer
Files	email_header_ecrefix.patch: regex fix for encoded_word in email.header.py

^{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 2012-06-03.22:08:01.039>
created_at = <Date 2010-09-28.01:57:44.430>
labels = ['type-bug', 'library', 'expert-email']
title = 'encoded_word regular expression in email.header.decode_header()'
updated_at = <Date 2012-06-03.22:08:01.038>
user = 'https://bugs.python.org/tkikuchi'

bugs.python.org fields:

activity = <Date 2012-06-03.22:08:01.038>
actor = 'r.david.murray'
assignee = 'none'
closed = True
closed_date = <Date 2012-06-03.22:08:01.039>
closer = 'r.david.murray'
components = ['Library (Lib)', 'email']
creation = <Date 2010-09-28.01:57:44.430>
creator = 'tkikuchi'
dependencies = []
files = ['19041']
hgrepos = []
issue_num = 9967
keywords = ['patch']
message_count = 2.0
messages = ['117500', '162236']
nosy_count = 3.0
nosy_names = ['barry', 'tkikuchi', 'r.david.murray']
pr_nums = []
priority = 'normal'
resolution = 'rejected'
stage = 'patch review'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue9967'
versions = ['Python 3.1', 'Python 2.7', 'Python 3.2', 'Python 3.3']

[tkikuchi]

Regular expression ecre for RFC2047 encoded_word in email.header module have bugs:

1. encoded_word should be separated by SPACEs in both leading and trailing ends. Current expression take care only trailing end.

2. encoded_text in the third part of encoded_word should not include literal ? or SPACE.

Also, ecre should not match against multiline.

The patch includes two test cases for test/test_email.py

[bitdancer]

Instead of doing this we've opted to follow postel and be generous in what we accept and go ahead and decode even if the leading and/or terminating space is missing (see bpo-1079).