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81 lines
2.8 KiB
81 lines
2.8 KiB
4 years ago
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diff --git a/Lib/sre_compile.py b/Lib/sre_compile.py
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index 7cda2b6..15d2324 100644
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--- a/Lib/sre_compile.py
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+++ b/Lib/sre_compile.py
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@@ -355,8 +355,6 @@ def _optimize_unicode(charset, fixup):
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def _simple(av):
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# check if av is a "simple" operator
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lo, hi = av[2].getwidth()
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- if lo == 0 and hi == MAXREPEAT:
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- raise error, "nothing to repeat"
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return lo == hi == 1 and av[2][0][0] != SUBPATTERN
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def _compile_info(code, pattern, flags):
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diff --git a/Lib/sre_parse.py b/Lib/sre_parse.py
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index 75f8c96..644441d 100644
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--- a/Lib/sre_parse.py
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+++ b/Lib/sre_parse.py
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@@ -147,7 +147,7 @@ class SubPattern:
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REPEATCODES = (MIN_REPEAT, MAX_REPEAT)
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for op, av in self.data:
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if op is BRANCH:
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- i = sys.maxint
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+ i = MAXREPEAT - 1
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j = 0
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for av in av[1]:
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l, h = av.getwidth()
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@@ -165,14 +165,14 @@ class SubPattern:
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hi = hi + j
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elif op in REPEATCODES:
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i, j = av[2].getwidth()
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- lo = lo + long(i) * av[0]
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- hi = hi + long(j) * av[1]
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+ lo = lo + i * av[0]
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+ hi = hi + j * av[1]
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elif op in UNITCODES:
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lo = lo + 1
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hi = hi + 1
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elif op == SUCCESS:
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break
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- self.width = int(min(lo, sys.maxint)), int(min(hi, sys.maxint))
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+ self.width = min(lo, MAXREPEAT - 1), min(hi, MAXREPEAT)
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return self.width
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class Tokenizer:
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diff --git a/Lib/test/test_re.py b/Lib/test/test_re.py
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index 18a81a2..f0827d8 100644
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--- a/Lib/test/test_re.py
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+++ b/Lib/test/test_re.py
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@@ -897,6 +897,17 @@ class ReTests(unittest.TestCase):
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with self.assertRaisesRegexp(sre_constants.error, '\?foo'):
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re.compile('(?P<?foo>)')
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+ def test_bug_2537(self):
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+ # issue 2537: empty submatches
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+ for outer_op in ('{0,}', '*', '+', '{1,187}'):
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+ for inner_op in ('{0,}', '*', '?'):
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+ r = re.compile("^((x|y)%s)%s" % (inner_op, outer_op))
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+ m = r.match("xyyzy")
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+ self.assertEqual(m.group(0), "xyy")
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+ self.assertEqual(m.group(1), "")
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+ self.assertEqual(m.group(2), "y")
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+
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+
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def run_re_tests():
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from test.re_tests import tests, SUCCEED, FAIL, SYNTAX_ERROR
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diff --git a/Lib/doctest.py b/Lib/doctest.py
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index 90bcca1..0ee40a2 100644
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--- a/Lib/doctest.py
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+++ b/Lib/doctest.py
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@@ -564,7 +564,7 @@ class DocTestParser:
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# Want consists of any non-blank lines that do not start with PS1.
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(?P<want> (?:(?![ ]*$) # Not a blank line
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(?![ ]*>>>) # Not a line starting with PS1
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- .*$\n? # But any other line
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+ .+$\n? # But any other line
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)*)
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''', re.MULTILINE | re.VERBOSE)
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