diff options
Diffstat (limited to 'Lib')
| -rw-r--r-- | Lib/test/test_re.py | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py index d23c49b..0d5f617 100644 --- a/Lib/test/test_re.py +++ b/Lib/test/test_re.py @@ -355,6 +355,32 @@ class ReTests(unittest.TestCase): self.assertEqual(re.search(r"\d\D\w\W\s\S", "1aa! a", re.UNICODE).group(0), "1aa! a") + def test_string_boundaries(self): + # See http://bugs.python.org/issue10713 + self.assertEqual(re.search(r"\b(abc)\b", "abc").group(1), + "abc") + # There's a word boundary at the start of a string. + self.assertTrue(re.match(r"\b", "abc")) + # A non-empty string includes a non-boundary zero-length match. + self.assertTrue(re.search(r"\B", "abc")) + # There is no non-boundary match at the start of a string. + self.assertFalse(re.match(r"\B", "abc")) + # However, an empty string contains no word boundaries, and also no + # non-boundaries. + self.assertEqual(re.search(r"\B", ""), None) + # This one is questionable and different from the perlre behaviour, + # but describes current behavior. + self.assertEqual(re.search(r"\b", ""), None) + # A single word-character string has two boundaries, but no + # non-boundary gaps. + self.assertEqual(len(re.findall(r"\b", "a")), 2) + self.assertEqual(len(re.findall(r"\B", "a")), 0) + # If there are no words, there are no boundaries + self.assertEqual(len(re.findall(r"\b", " ")), 0) + self.assertEqual(len(re.findall(r"\b", " ")), 0) + # Can match around the whitespace. + self.assertEqual(len(re.findall(r"\B", " ")), 2) + def test_bigcharset(self): self.assertEqual(re.match("([\u2222\u2223])", "\u2222").group(1), "\u2222") |