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gh-133306: Support \z as a synonym for \Z in regular expressions (GH-133314)

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\Z was an error inherited from PCRE 0.95. It was fixed in PCRE 2.0.
In other engines, \Z means not “anchor at string end”, but
“anchor before optional newline at string end”.

\z means “anchor at string end” in most RE engines.
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Serhiy Storchaka 2025-05-03 10:54:33 +03:00 • committed by GitHub
parent fe44fc4f43
commit ac56f8cc8d
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8 changed files with 31 additions and 10 deletions
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Lib/test/re_tests.py
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@ -531,7 +531,7 @@ xyzabc
(r'a[ ]*?\ (\d+).*', 'a 10', SUCCEED, 'found', 'a 10'),
(r'a[ ]*?\ (\d+).*', 'a 10', SUCCEED, 'found', 'a 10'),
# bug 127259: \Z shouldn't depend on multiline mode
(r'(?ms).*?x\s*\Z(.*)','xx\nx\n', SUCCEED, 'g1', ''),
(r'(?ms).*?x\s*\z(.*)','xx\nx\n', SUCCEED, 'g1', ''),
# bug 128899: uppercase literals under the ignorecase flag
(r'(?i)M+', 'MMM', SUCCEED, 'found', 'MMM'),
(r'(?i)m+', 'MMM', SUCCEED, 'found', 'MMM'),