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Issue #2537: Remove breaked check which prevented valid regular expressions.

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Patch by Meador Inge.

See also issue #18647.
This commit is contained in:
Serhiy Storchaka 2013-08-19 23:18:23 +03:00
parent 1ca66edbc5
commit 98985a1980
2 changed files with 10 additions and 2 deletions
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2
Lib/sre_compile.py
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@ -358,8 +358,6 @@ def _optimize_unicode(charset, fixup):
def _simple(av):
# check if av is a "simple" operator
lo, hi = av[2].getwidth()
#if lo == 0 and hi == MAXREPEAT:
# raise error("nothing to repeat")
return lo == hi == 1 and av[2][0][0] != SUBPATTERN
def _compile_info(code, pattern, flags):

10
Lib/test/test_re.py
View file

@ -1051,6 +1051,16 @@ class ReTests(unittest.TestCase):
[b'xyz'], msg=pattern)
def test_bug_2537(self):
# issue 2537: empty submatches
for outer_op in ('{0,}', '*', '+', '{1,187}'):
for inner_op in ('{0,}', '*', '?'):
r = re.compile("^((x|y)%s)%s" % (inner_op, outer_op))
m = r.match("xyyzy")
self.assertEqual(m.group(0), "xyy")
self.assertEqual(m.group(1), "")
self.assertEqual(m.group(2), "y")
def run_re_tests():
from test.re_tests import tests, SUCCEED, FAIL, SYNTAX_ERROR
if verbose: