# HG changeset patch
# User MRAB <regex@mrabarnett.plus.com>
# Date 1357581809 0
# Node ID 2d764503dec3031b16d421376c6e5d75eeff8d7a
# Parent 9009178e08d955a915121580a84e4355ce24018d
Issue #13899: re pattern r"[\A]" should work like "A" but matches nothing. Ditto B and Z.
diff -r 9009178e08d9 -r 2d764503dec3 Lib/sre_parse.py
--- a/Lib/sre_parse.py	Mon Jan 07 14:19:12 2013 +0000
+++ b/Lib/sre_parse.py	Mon Jan 07 18:03:29 2013 +0000
@@ -245,7 +245,7 @@
 if code:
 return code
 code = CATEGORIES.get(escape)
- if code:
+ if code and code[0] == IN:
 return code
 try:
 c = escape[1:2]
diff -r 9009178e08d9 -r 2d764503dec3 Lib/test/test_re.py
--- a/Lib/test/test_re.py	Mon Jan 07 14:19:12 2013 +0000
+++ b/Lib/test/test_re.py	Mon Jan 07 18:03:29 2013 +0000
@@ -974,6 +974,12 @@
 self.assertEqual(re.findall(r"(?i)(a)1円", "aa \u0100"), ['a'])
 self.assertEqual(re.match(r"(?s).{1,3}", "\u0100\u0100").span(), (0, 2))
 
+ def test_bug_13899(self):
+ # Issue #13899: re pattern r"[\A]" should work like "A" but matches
+ # nothing. Ditto B and Z.
+ self.assertEqual(re.findall(r'[\A\B\b\C\Z]', 'AB\bCZ'), ['A', 'B',
+ '\b', 'C', 'Z'])
+
 def run_re_tests():
 from test.re_tests import tests, SUCCEED, FAIL, SYNTAX_ERROR
 if verbose:
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