1 files changed, 10 insertions, 7 deletions
diff --git a/Lib/re.py b/Lib/re.py
index aab5d37..9b01f3e 100644
--- a/Lib/re.py
+++ b/Lib/re.py
@@ -225,11 +225,13 @@ _MAXCACHE = 100
 
 def _compile(*key):
     # internal: compile pattern
-    cachekey = (type(key[0]),) + key
-    p = _cache.get(cachekey)
-    if p is not None:
-        return p
     pattern, flags = key
+    bypass_cache = flags & DEBUG
+    if not bypass_cache:
+        cachekey = (type(key[0]),) + key
+        p = _cache.get(cachekey)
+        if p is not None:
+            return p
     if isinstance(pattern, _pattern_type):
         if flags:
             raise ValueError('Cannot process flags argument with a compiled pattern')
@@ -240,9 +242,10 @@ def _compile(*key):
         p = sre_compile.compile(pattern, flags)
     except error, v:
         raise error, v # invalid expression
-    if len(_cache) >= _MAXCACHE:
-        _cache.clear()
-    _cache[cachekey] = p
+    if not bypass_cache:
+        if len(_cache) >= _MAXCACHE:
+            _cache.clear()
+        _cache[cachekey] = p
     return p
 
 def _compile_repl(*key):