[3.14] gh-98820: Fix quadratic time in csv.Sniffer for quoted fields (GH-154867) - #155117
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serhiy-storchaka merged 1 commit intoAug 4, 2026
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…ields (pythonGH-154867) The regular expressions which look for a quoted field matched its body lazily, so a closing quote which was not followed by a delimiter was retried with every following quote, to the end of the sample. Match the body possessively instead: it ends at the first quote which is not doubled, as it does for a reader. (cherry picked from commit 476fb09) Co-authored-by: Serhiy Storchaka <storchaka@gmail.com> Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>
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The regular expressions which look for a quoted field matched its body
lazily, so a closing quote which was not followed by a delimiter was
retried with every following quote, to the end of the sample. Match
the body possessively instead: it ends at the first quote which is not
doubled, as it does for a reader.
(cherry picked from commit 476fb09)
Co-authored-by: Serhiy Storchaka storchaka@gmail.com
Co-authored-by: Claude Opus 5 (1M context) noreply@anthropic.com