From 13ac9926ac43d3bff39a08301696105208774b6e Mon Sep 17 00:00:00 2001
From: Fredrik Lundh <fredrik@pythonware.com>
Date: Sat, 7 Oct 2000 17:38:23 +0000
Subject: [PATCH] Fixed too ambitious "nothing to repeat" check.  Closes bug
 #114033.

---
 Lib/sre_compile.py   | 2 +-
 Lib/sre_constants.py | 2 ++
 Lib/sre_parse.py     | 2 --
 Lib/test/re_tests.py | 3 +++
 4 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/Lib/sre_compile.py b/Lib/sre_compile.py
index 97a57e2db19..dc508e57cdc 100644
--- a/Lib/sre_compile.py
+++ b/Lib/sre_compile.py
@@ -222,7 +222,7 @@ def _optimize_charset(charset, fixup):
 def _simple(av):
     # check if av is a "simple" operator
     lo, hi = av[2].getwidth()
-    if lo == 0:
+    if lo == 0 and hi == MAXREPEAT:
         raise error, "nothing to repeat"
     return lo == hi == 1 and av[2][0][0] != SUBPATTERN
 
diff --git a/Lib/sre_constants.py b/Lib/sre_constants.py
index 5a20930ce1d..ea649c04829 100644
--- a/Lib/sre_constants.py
+++ b/Lib/sre_constants.py
@@ -9,6 +9,8 @@
 # See the sre.py file for information on usage and redistribution.
 #
 
+MAXREPEAT = 65535
+
 # should this really be here?
 
 class error(Exception):
diff --git a/Lib/sre_parse.py b/Lib/sre_parse.py
index 9cbbc0254e8..7c36d4f2dcb 100644
--- a/Lib/sre_parse.py
+++ b/Lib/sre_parse.py
@@ -12,8 +12,6 @@ import string, sys
 
 from sre_constants import *
 
-MAXREPEAT = 65535
-
 SPECIAL_CHARS = ".\\[{()*+?^$|"
 REPEAT_CHARS = "*+?{"
 
diff --git a/Lib/test/re_tests.py b/Lib/test/re_tests.py
index 7c541752f28..2d3155dacfe 100755
--- a/Lib/test/re_tests.py
+++ b/Lib/test/re_tests.py
@@ -615,10 +615,13 @@ xyzabc
     # bug 112468: various expected syntax errors
     ('(', '', SYNTAX_ERROR),
     ('[\\41]', '!', SUCCEED, 'found', '!'),
+    # bug 114033: nothing to repeat
+    (r'(x?)?', 'x', SUCCEED, 'found', 'x'),
     # bug 115040: rescan if flags are modified inside pattern
     (r' (?x)foo ', 'foo', SUCCEED, 'found', 'foo'),
     # bug 115618: negative lookahead
     (r'(?<!abc)(d.f)', 'abcdefdof', SUCCEED, 'found', 'dof'),
     # bug 116251: character class bug
     (r'[\w-]+', 'laser_beam', SUCCEED, 'found', 'laser_beam'),
+
 ]