Unicode word boundries

[revo]

BPO	27878
Nosy	@ezio-melotti

^{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 2016-08-27.14:56:48.761>
created_at = <Date 2016-08-27.14:36:09.938>
labels = ['expert-regex', 'type-bug', 'invalid']
title = 'Unicode word boundries'
updated_at = <Date 2016-08-27.14:56:48.749>
user = 'https://bugs.python.org/revo'

bugs.python.org fields:

activity = <Date 2016-08-27.14:56:48.749>
actor = 'SilentGhost'
assignee = 'none'
closed = True
closed_date = <Date 2016-08-27.14:56:48.761>
closer = 'SilentGhost'
components = ['Regular Expressions']
creation = <Date 2016-08-27.14:36:09.938>
creator = 'revo'
dependencies = []
files = []
hgrepos = []
issue_num = 27878
keywords = []
message_count = 2.0
messages = ['273782', '273783']
nosy_count = 4.0
nosy_names = ['ezio.melotti', 'mrabarnett', 'SilentGhost', 'revo']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue27878'
versions = []

[revo]

According to UAX #29 - unicode word boundaries (rule WB5a), an apostrophe includes U+0027 ( ' ) APOSTROPHE and U+2019 ( ’ ) RIGHT SINGLE QUOTATION MARK (curly apostrophe).

However regex module only implements U+0027 and the second kind (U+2019) is missing:

/* Break between apostrophe and vowels (French, Italian). */
/* WB5a */
if (pos_m1 >= 0 && char_at(state->text, pos_m1) == '\'' &&
is_unicode_vowel(char_at(state->text, text_pos)))
return TRUE;

Source code

[SilentGhost]

regex module is not in standard library, on the latest 3.6 branch re module breaks on curly apostrophe just fine. Perhaps, try reporting this issue on the bitbucket tracker?