Issue #13169: The maximal repetition number in a regular expression has been

increased from 65534 to 2147483647 (on 32-bit platform) or 4294967294 (on
64-bit).

1 files changed, 7 insertions, 2 deletions

diff --git a/Lib/sre_parse.py b/Lib/sre_parse.py
index 19dd4fc4bc..045a5ebfef 100644
--- a/Lib/sre_parse.py
+++ b/Lib/sre_parse.py
@@ -15,6 +15,7 @@
 import sys
 
 from sre_constants import *
+from _sre import MAXREPEAT
 
 SPECIAL_CHARS = ".\\[{()*+?^$|"
 REPEAT_CHARS = "*+?{"
@@ -505,10 +506,14 @@ def _parse(source, state):
                     continue
                 if lo:
                     min = int(lo)
+                    if min >= MAXREPEAT:
+                        raise OverflowError("the repetition number is too large")
                 if hi:
                     max = int(hi)
-                if max < min:
-                    raise error("bad repeat interval")
+                    if max >= MAXREPEAT:
+                        raise OverflowError("the repetition number is too large")
+                    if max < min:
+                        raise error("bad repeat interval")
             else:
                 raise error("not supported")
             # figure out which item to repeat