re.split doesn't respect MULTILINE

[dabrahams]

BPO	15536
Nosy	@ezio-melotti, @dabrahams, @serhiy-storchaka
Superseder	bpo-15537: MULTILINE confuses re.split

^{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 2012-08-04.21:07:14.545>
created_at = <Date 2012-08-02.14:41:18.477>
labels = ['expert-regex', 'type-bug']
title = "re.split doesn't respect MULTILINE"
updated_at = <Date 2012-08-04.21:07:14.545>
user = 'https://github.com/dabrahams'

bugs.python.org fields:

activity = <Date 2012-08-04.21:07:14.545>
actor = 'r.david.murray'
assignee = 'none'
closed = True
closed_date = <Date 2012-08-04.21:07:14.545>
closer = 'r.david.murray'
components = ['Regular Expressions']
creation = <Date 2012-08-02.14:41:18.477>
creator = 'dabrahams'
dependencies = []
files = []
hgrepos = []
issue_num = 15536
keywords = []
message_count = 2.0
messages = ['167224', '167241']
nosy_count = 4.0
nosy_names = ['ezio.melotti', 'mrabarnett', 'dabrahams', 'serhiy.storchaka']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'resolved'
status = 'closed'
superseder = '15537'
type = 'behavior'
url = 'https://bugs.python.org/issue15536'
versions = ['Python 2.7']

[dabrahams]

This session demonstrates. See especially the very last expression evaluated

>>> s='''this is the end
s='''this is the end
... your only friend
your only friend
... the end'''
the end'''
>>> re.split('^', s, re.MULTILINE)
re.split('^', s, re.MULTILINE)
['this is the end\nyour only friend\nthe end']
>>> re.split('t', s, re.MULTILINE)
re.split('t', s, re.MULTILINE)
['', 'his is ', 'he end\nyour only friend\n', 'he end']
>>> re.split('\n', s, re.MULTILINE)
re.split('\n', s, re.MULTILINE)
['this is the end', 'your only friend', 'the end']
>>> re.split('(?<=\n)', s, re.MULTILINE)
re.split('(?<=\n)', s, re.MULTILINE)
['this is the end\nyour only friend\nthe end']
>>> re.split('^y', s, re.MULTILINE)
re.split('^y', s, re.MULTILINE)
['this is the end\nyour only friend\nthe end']
>>> re.split('$', s, re.MULTILINE)
re.split('$', s, re.MULTILINE)
['this is the end\nyour only friend\nthe end']
>>> re.split('$\n', s, re.MULTILINE)
re.split('$\n', s, re.MULTILINE)
['this is the end\nyour only friend\nthe end']
>>> re.split('\n', s, re.MULTILINE)
re.split('\n', s, re.MULTILINE)
['this is the end', 'your only friend', 'the end']
>>> re.split('^t', s, re.MULTILINE)
re.split('^t', s, re.MULTILINE)
['', 'his is the end\nyour only friend\nthe end']
>>> re.split('^t', s)
re.split('^t', s)
['', 'his is the end\nyour only friend\nthe end']
>>>

[serhiy-storchaka]

Same as for bpo-15537.