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From: jak <nospam@please.ty>
Newsgroups: comp.lang.python
Subject: Re: Correct syntax for pathological re.search()
Date: Sat, 19 Oct 2024 00:15:23 +0200
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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.


Hi,
Allow me to be fussy: r"\\sout{" and r"\\sout\{" are similar but not
equivalent. 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. In some online regexs have these results:

r"\\sout{"   :   1 match ( 7 steps, 620 μs )

r"\\sout\{"  :   1 match ( 7 steps, 360 μs )