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GeezerVison is showing github.com — re.sub() does not work correctly on '.' pattern and \n · Issue #75110 · python/cpython

re.sub() does not work correctly on '.' pattern and \n #75110

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re.sub() does not work correctly on '.' pattern and \n#75110
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topic-regextype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

Description

mrh1997
mannequin
opened on Jul 13, 2017
Issue body actions
BPO 30927
Nosy @ezio-melotti, @mrh1997

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 2017-07-13.23:58:25.716>
created_at = <Date 2017-07-13.21:27:56.387>
labels = ['expert-regex', 'type-bug', 'invalid']
title = "re.sub() does not work correctly on '.' pattern and \\n"
updated_at = <Date 2017-07-13.23:58:25.715>
user = 'https://github.com/mrh1997'

bugs.python.org fields:

activity = <Date 2017-07-13.23:58:25.715>
actor = 'mrabarnett'
assignee = 'none'
closed = True
closed_date = <Date 2017-07-13.23:58:25.716>
closer = 'mrabarnett'
components = ['Regular Expressions']
creation = <Date 2017-07-13.21:27:56.387>
creator = 'mrh1997'
dependencies = []
files = []
hgrepos = []
issue_num = 30927
keywords = []
message_count = 2.0
messages = ['298316', '298323']
nosy_count = 3.0
nosy_names = ['ezio.melotti', 'mrabarnett', 'mrh1997']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue30927'
versions = ['Python 3.6']

Activity

  1. mrh1997 commented on Jul 13, 2017

    @mrh1997
    mrh1997mannequin
    on Jul 13, 2017
    MannequinAuthor
    More actions

    When running the command

        re.sub(r'X.', '+', '-X\n-', re.DOTALL)

    you get '-X\n-' instead of '-+-'.

    Curiously findall works correctly:

    re.findall(r'X.', '-X\n-', re.DOTALL) => ['X\n']
  2. mrh1997
    added
    topic-regex
    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
    on Jul 13, 2017

  3. mrabarnett commented on Jul 13, 2017

    @mrabarnett
    mrabarnettmannequin
    on Jul 13, 2017
    Mannequin
    More actions

    The 4th parameter is the count, not the flags:

    sub(pattern, repl, string, count=0, flags=0)
    >>> re.sub(r'X.', '+', '-X\n-', flags=re.DOTALL)
'-+-'
  4. mrabarnett
    closed this as completedon Jul 13, 2017
  5. mrabarnett
    added
    invalid
    on Jul 13, 2017
  6. ezio-melotti
    transferred this issue fromon Apr 10, 2022
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