8000 re.sub is only replacing max. of 2 string found by regexp. · Issue #79724 · python/cpython · GitHub
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saga mannequin opened this issue Dec 20, 2018 · 2 comments
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re.sub is only replacing max. of 2 string found by regexp. #79724

saga mannequin opened this issue Dec 20, 2018 · 2 comments
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stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error

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@saga
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Mannequin
saga mannequin commented Dec 20, 2018
BPO 35543
Nosy @serhiy-storchaka

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 2018-12-20.08:32:12.140>
created_at = <Date 2018-12-20.08:26:30.724>
labels = ['invalid', 'type-bug', 'library']
title = 're.sub is only replacing max. of 2 string found by regexp.'
updated_at = <Date 2018-12-20.08:32:12.138>
user = 'https://bugs.python.org/saga'

bugs.python.org fields:

activity = <Date 2018-12-20.08:32:12.138>
actor = 'serhiy.storchaka'
assignee = 'none'
closed = True
closed_date = <Date 2018-12-20.08:32:12.140>
closer = 'serhiy.storchaka'
components = ['Library (Lib)']
creation = <Date 2018-12-20.08:26:30.724>
creator = 'saga'
dependencies = []
files = []
hgrepos = []
issue_num = 35543
keywords = []
message_count = 2.0
messages = ['332198', '332200']
nosy_count = 2.0
nosy_names = ['serhiy.storchaka', 'saga']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue35543'
versions = ['Python 3.5']
@saga
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saga mannequin commented Dec 20, 2018

Below are the logs:

>>> dat = '"10GE" "4x" "AMPC" "B3" "BUILTIN" "DOWN" "LU" "SFP+" "ether" "xe" "DOWN" "MPC" "BUILTIN"'
>>> type = re.subn(r'\"BUILTIN\"|\"B\d\"|\"I\d\"|\"LU\"|\"Trinity\"|\"Trio\"|\"DOWN\"|\"UNKNOWN\"|'
...     r'^AND$|\"Q\"|\"MPC\"|\"EA\d\"|\"3D\"', '', dat, re.I)
>>> type
('"10GE" "4x" "AMPC"   "DOWN" "LU" "SFP+" "ether" "xe" "DOWN" "MPC" "BUILTIN"', 2)
>>> dat = '"10GE" "4x" "AMPC"   "DOWN" "LU" "SFP+" "ether" "xe" "DOWN" "MPC" "BUILTIN"'
>>> type = re.subn(r'\"BUILTIN\"|\"B\d\"|\"I\d\"|\"LU\"|\"Trinity\"|\"Trio\"|\"DOWN\"|\"UNKNOWN\"|'
...     r'^AND$|\"Q\"|\"MPC\"|\"EA\d\"|\"3D\"', '', dat, re.I)
>>> type
('"10GE" "4x" "AMPC"     "SFP+" "ether" "xe" "DOWN" "MPC" "BUILTIN"', 2)
>>> dat = '"10GE" "4x" "AMPC"     "SFP+" "ether" "xe" "DOWN" "MPC" "BUILTIN"'
>>> type = re.subn(r'\"BUILTIN\"|\"B\d\"|\"I\d\"|\"LU\"|\"Trinity\"|\"Trio\"|\"DOWN\"|\"UNKNOWN\"|'
...     r'^AND$|\"Q\"|\"MPC\"|\"EA\d\"|\"3D\"', '', dat, re.I)
>>> type
('"10GE" "4x" "AMPC"     "SFP+" "ether" "xe"   "BUILTIN"', 2)
>>> dat = '"10GE" "4x" "AMPC"     "SFP+" "ether" "xe"   "BUILTIN"'
>>> type = re.subn(r'\"BUILTIN\"|\"B\d\"|\"I\d\"|\"LU\"|\"Trinity\"|\"Trio\"|\"DOWN\"|\"UNKNOWN\"|'
...     r'^AND$|\"Q\"|\"MPC\"|\"EA\d\"|\"3D\"', '', dat, re.I)
>>> type
('"10GE" "4x" "AMPC"     "SFP+" "ether" "xe"   ', 1)
>>>

@saga saga mannequin added stdlib Python modules in the Lib dir type-bug An unexpected behavior, bug, or error labels Dec 20, 2018
@serhiy-storchaka
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The third argument of re.sub() is the maximal number of replacements. re.I == 2.

sub(pattern, repl, string, count=0, flags=0)
    Return the string obtained by replacing the leftmost
    non-overlapping occurrences of the pattern in string by the
    replacement repl.  repl can be either a string or a callable;
    if a string, backslash escapes in it are processed.  If it is
    a callable, it's passed the Match object and must return
    a replacement string to be used.

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
@ghost ghost mentioned this issue Apr 12, 2022
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@hauntsaninja hauntsaninja mentioned this issue Dec 1, 2022
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