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Closing issue1761.

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Surprising behaviour of the "$" regexp: it matches the
end of the string, AND just before the newline at the end
of the string::

    re.sub('$', '#', 'foo\n') == 'foo#\n#'

Python is consistent with Perl and the pcre library, so
we just document it.
Guido prefers "\Z" to match only the end of the string.
This commit is contained in:
Amaury Forgeot d'Arc 2008-01-10 21:59:42 +00:00
parent e850c466c7
commit d08a8ebf2a
2 changed files with 15 additions and 1 deletions
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12
Lib/test/test_re.py
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@ -671,6 +671,18 @@ class ReTests(unittest.TestCase):
q = p.match(upper_char)
self.assertNotEqual(q, None)
def test_dollar_matches_twice(self):
"$ matches the end of string, and just before the terminating \n"
pattern = re.compile('$')
self.assertEqual(pattern.sub('#', 'a\nb\n'), 'a\nb#\n#')
self.assertEqual(pattern.sub('#', 'a\nb\nc'), 'a\nb\nc#')
self.assertEqual(pattern.sub('#', '\n'), '#\n#')
pattern = re.compile('$', re.MULTILINE)
self.assertEqual(pattern.sub('#', 'a\nb\n' ), 'a#\nb#\n#' )
self.assertEqual(pattern.sub('#', 'a\nb\nc'), 'a#\nb#\nc#')
self.assertEqual(pattern.sub('#', '\n'), '#\n#')
def run_re_tests():
from test.re_tests import benchmarks, tests, SUCCEED, FAIL, SYNTAX_ERROR