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gh-109638: Fix for significant backtracking in csv.Sniffer #109639

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gh-109638: Fix for significant backtracking in csv.Sniffer #109639

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35154f3
Performance improvements for csv doublequote regex
sg3-141-592 Sep 9, 2023
16d9612
📜🤖 Added by blurb_it.
blurb-it[bot] Sep 21, 2023
2b29051
Revert "📜🤖 Added by blurb_it."
AA-Turner Sep 22, 2023
0265641
Converting zero-length lookahead assertions to atomic group
sg3-141-592 Sep 23, 2023
a9c4adf
Merge branch 'main' into main
serhiy-storchaka Jul 14, 2026
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2 changes: 1 addition & 1 deletion Lib/csv.py
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Original file line number Diff line number Diff line change
Expand Up @@ -331,7 +331,7 @@ def _guess_quote_and_delimiter(self, data, delimiters):
# if we see an extra quote between delimiters, we've got a
# double quoted format
dq_regexp = re.compile(
r"((%(delim)s)|^)\W*%(quote)s[^%(delim)s\n]*%(quote)s[^%(delim)s\n]*%(quote)s\W*((%(delim)s)|$)" % \
r"((%(delim)s)|^)\W*%(quote)s(?>[^%(delim)s\n]*)%(quote)s[^%(delim)s\n]*%(quote)s\W*((%(delim)s)|$)" % \
{'delim':re.escape(delim), 'quote':quotechar}, re.MULTILINE)


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