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From: "Peter J. Holzer" <hjp-python@hjp.at>
Newsgroups: comp.lang.python
Subject: Re: Correct syntax for pathological re.search()
Date: Mon, 21 Oct 2024 21:10:49 +0200
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On 2024-10-19 00:15:23 +0200, jak via Python-list wrote:
> Peter J. Holzer ha scritto:
> > As a trivial example, the regular expressions r"\\sout{" and r"\\sout\{"
> > are equivalent (the \ before the { is redundant). Yet
> > re.compile(s).pattern preserves the difference between the two strings.
>=20
> Allow me to be fussy: r"\\sout{" and r"\\sout\{" are similar but not
> equivalent.
They are. Both will match the 6 character string=20
0005c \ REVERSE SOLIDUS
00073 s LATIN SMALL LETTER S
0006f o LATIN SMALL LETTER O
00075 u LATIN SMALL LETTER U
00074 t LATIN SMALL LETTER T
0007b { LEFT CURLY BRACKET
> If you omit the backslash, the parser will have to determine if the
> graph is part of regular expression {n, m} and will take more time.
Yes, that's the parser. But the result of parsing will be the same:
The string will end in a literal backslash.
hp
--=20
_ | Peter J. Holzer | Story must make more sense than reality.
|_|_) | |
| | | hjp@hjp.at | -- Charles Stross, "Creative writing
__/ | http://www.hjp.at/ | challenge!"
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