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Problem with regular expression #48469

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carlosklock mannequin opened this issue Oct 28, 2008 · 3 comments
Closed

Problem with regular expression #48469

carlosklock mannequin opened this issue Oct 28, 2008 · 3 comments
Labels
topic-regex type-bug An unexpected behavior, bug, or error

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@carlosklock
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Mannequin

carlosklock mannequin commented Oct 28, 2008

BPO 4219
Nosy @vstinner

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 2008-10-28.16:55:53.830>
created_at = <Date 2008-10-28.15:46:12.597>
labels = ['expert-regex', 'type-bug', 'invalid']
title = 'Problem with regular expression'
updated_at = <Date 2008-10-28.16:55:53.828>
user = 'https://bugs.python.org/carlosklock'

bugs.python.org fields:

activity = <Date 2008-10-28.16:55:53.828>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2008-10-28.16:55:53.830>
closer = 'georg.brandl'
components = ['Regular Expressions']
creation = <Date 2008-10-28.15:46:12.597>
creator = 'carlosklock'
dependencies = []
files = []
hgrepos = []
issue_num = 4219
keywords = []
message_count = 3.0
messages = ['75286', '75287', '75288']
nosy_count = 2.0
nosy_names = ['vstinner', 'carlosklock']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue4219'
versions = ['Python 2.5']
@carlosklock
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carlosklock mannequin commented Oct 28, 2008

Hello,

I am having a weird problem with regex. I am trying to get the tokens
that match the pattern below, but it is not working only for a specific
case. I do this for many lines of text, and it works, except for the
string '1214578800'.

Any idea of what is happening? Is it a problem of my code or a bug in
regular expressions?

Thanks for any help,

Carlos.

import re
r =
re.compile(",'([0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9][0-9])'[,|)]")
text =
"('25','2','3','2','0','1','0','0/350','30','21','5','','1211641200','1214578800','0','2','1214662622');"
timestamps = r.findall(text)
print timestamps
OUTPUT:
Python 2.5.2 (r252:60911, Jul 31 2008, 17:31:22) 
[GCC 4.2.3 (Ubuntu 4.2.3-2ubuntu7)] on Trabalho15, Standard
>>> ['1211641200', '1214662622']

@carlosklock carlosklock mannequin added topic-regex type-bug An unexpected behavior, bug, or error labels Oct 28, 2008
@vstinner
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It's not a Python bug: your regex is invalid. When the regex
finds '1211641200', it reads >,'1211641200',< includind the last
comma. So the cursor will be at the apostrophe before 1214578800:
...200','121457...
--------^

You have to change your regex to not check the comma or use a
non-matching group like (?<=,) and (?=[,)]).

Note: you're using [,|)] which matchs >,<, >|<, and >)<. I guess that
you wanted [,)].

@carlosklock
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carlosklock mannequin commented Oct 28, 2008

Sorry, it is really a problem with the comma.

Thanks for helping! :)

@ezio-melotti ezio-melotti transferred this issue from another repository Apr 10, 2022
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