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BOFH excuse #49: Bogon emissions

comp / comp.lang.python / re.DOTALL

SubjectAuthor
* re.DOTALLStefan Ram
+- Re: re.DOTALLStefan Ram
`- Re: re.DOTALL (Posting On Python-List Prohibited)Lawrence D'Oliveiro

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Subject: re.DOTALL
From: Stefan Ram
Newsgroups: comp.lang.python
Organization: Stefan Ram
Date: Wed, 17 Jul 2024 18:09 UTC
Path: eternal-september.org!news.eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!not-for-mail
From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.python
Subject: re.DOTALL
Date: 17 Jul 2024 18:09:51 GMT
Organization: Stefan Ram
Lines: 41
Expires: 1 Jul 2025 11:59:58 GMT
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Below, I use [\s\S] to match each and every character.
I can't seem to get the same effect using "re.DOTALL"!

Yet the Python Library Reference says,

|(Dot.) In the default mode, this matches any character except
|a newline. If the DOTALL flag has been specified, this
|matches any character including a newline.
what the Python Library Reference says.

main.py

import re

text = '''
alpha
<hr>
gamma
<hr>
epsilon
'''[ 1: -1 ]

pattern = r'^.*?\n<hr.*?\n(.*)\n<hr.*$'

output = re.sub( pattern.replace( r'.', r'[\s\S]' ), r'\1', text )
print( output )

print( '--' )

output = re.sub( pattern, r'\1', text, re.DOTALL )
print( output )

stdout

gamma
--
alpha
<hr>
gamma
<hr>
epsilon

Subject: Re: re.DOTALL
From: Stefan Ram
Newsgroups: comp.lang.python
Organization: Stefan Ram
Date: Wed, 17 Jul 2024 18:21 UTC
References: 1
Path: eternal-september.org!news.eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!not-for-mail
From: ram@zedat.fu-berlin.de (Stefan Ram)
Newsgroups: comp.lang.python
Subject: Re: re.DOTALL
Date: 17 Jul 2024 18:21:26 GMT
Organization: Stefan Ram
Lines: 4
Expires: 1 Jul 2025 11:59:58 GMT
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ram@zedat.fu-berlin.de (Stefan Ram) wrote or quoted:
>I can't seem to get the same effect using "re.DOTALL"!

PS: But (?s) works.

Subject: Re: re.DOTALL (Posting On Python-List Prohibited)
From: Lawrence D'Oliv
Newsgroups: comp.lang.python
Organization: A noiseless patient Spider
Date: Wed, 17 Jul 2024 23:54 UTC
References: 1
Path: eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: ldo@nz.invalid (Lawrence D'Oliveiro)
Newsgroups: comp.lang.python
Subject: Re: re.DOTALL (Posting On Python-List Prohibited)
Date: Wed, 17 Jul 2024 23:54:25 -0000 (UTC)
Organization: A noiseless patient Spider
Lines: 15
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On 17 Jul 2024 18:09:51 GMT, Stefan Ram wrote:

> Below, I use [\s\S] to match each and every character.
> I can't seem to get the same effect using "re.DOTALL"!

This might help clarify things:

text = "alpha\n<hr>\ngamma\n<hr>\nepsilon"
pattern = r'^(.*?)\n(<hr.*?)\n(.*)\n(<hr.*)$'

re.search(pattern, text, re.DOTALL).groups()

⇒

('alpha', '<hr>', 'gamma', '<hr>\nepsilon')

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