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GeezerVison is showing github.com — gh-156185: Ignore all ASCII whitespace in re \p{} property names by Georgefifth · Pull Request #156304 · python/cpython

gh-156185: Ignore all ASCII whitespace in re \p{} property names #156304

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gh-156185: Ignore all ASCII whitespace in re \p{} property names #156304

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gh-156185: Ignore all ASCII whitespace in re \p{} property names
Georgefifth Aug 28, 2026
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13 changes: 9 additions & 4 deletions 13 Lib/re/_properties.py
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Original file line number Diff line number Diff line change
Expand Up @@ -208,12 +208,17 @@ def _analytic_ranges():
}


# Characters that are not significant in a Unicode property or value name
# (see _normalize): ASCII whitespace, hyphens and underscores.
_NON_SIGNIFICANT = str.maketrans("", "", " \t\n\r\f\v_-")


def _normalize(name):
# Unicode property and value names are matched loosely: case, spaces,
# hyphens and underscores are not significant, and an initial "is" prefix
# is ignored (UAX #44 5.9, "Matching Rules", UAX44-LM3;
# Unicode property and value names are matched loosely: case, whitespace,
# hyphens and underscores are not significant, and an initial "is"
# prefix is ignored (UAX #44 5.9, "Matching Rules", UAX44-LM3;
# https://www.unicode.org/reports/tr44/).
name = name.lower().replace("_", "").replace("-", "").replace(" ", "")
name = name.lower().translate(_NON_SIGNIFICANT)
# Strip a leading "is", unless "is" is the whole name and so not a prefix
# (e.g. the Line_Break value lb=IS).
if name != "is":
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6 changes: 6 additions & 0 deletions 6 Lib/test/test_re.py
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Expand Up @@ -929,6 +929,12 @@ def test_property_escapes(self):
self.assertTrue(re.fullmatch(r'\p{General_Category=Lu}+', 'ABC'))
self.assertTrue(re.fullmatch(r'\p{ lu }+', 'ABC'))
self.assertTrue(re.fullmatch(r'\p{LU}+', 'ABC'))
# All ASCII whitespace is ignored, not just spaces (UAX44-LM3;
# gh-156185).
for ws in " \t\n\r\f\v":
with self.subTest(ws=ws):
self.assertTrue(re.fullmatch(r'\p{L%su}+' % ws, 'ABC'))
self.assertTrue(re.fullmatch(r'\p{gc%s=L%su}+' % (ws, ws), 'ABC'))
# An initial "is" prefix is ignored (UAX44-LM3), on the property name
# and on a gc value; "is" alone is not a prefix (cf. lb=IS).
self.assertTrue(re.fullmatch(r'\p{isLu}+', 'ABC'))
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