diff -r 6f77eb5311b5 Modules/_sre.c
--- a/Modules/_sre.c	Mon Oct 29 21:23:01 2007 +0100
+++ b/Modules/_sre.c	Fri Nov 02 23:00:30 2007 +0100
@@ -99,6 +99,7 @@ static char copyright[] =
 #define SRE_ERROR_STATE -2 /* illegal state */
 #define SRE_ERROR_RECURSION_LIMIT -3 /* runaway recursion */
 #define SRE_ERROR_MEMORY -9 /* out of memory */
+#define SRE_ERROR_INTERRUPTED -10 /* signal handler raised exception */
 
 #if defined(VERBOSE)
 #define TRACE(v) printf v
@@ -809,6 +810,7 @@ SRE_MATCH(SRE_STATE* state, SRE_CODE* pa
     Py_ssize_t alloc_pos, ctx_pos = -1;
     Py_ssize_t i, ret = 0;
     Py_ssize_t jump;
+    unsigned int sigcount=0;
 
     SRE_MATCH_CONTEXT* ctx;
     SRE_MATCH_CONTEXT* nextctx;
@@ -835,11 +837,13 @@ entrance:
         }
         ctx->pattern += ctx->pattern[1] + 1;
     }
-
+    
     for (;;) {
+	    ++sigcount;
+	    if ((0 == (sigcount & 0xfff)) && PyErr_CheckSignals()) RETURN_ERROR(SRE_ERROR_INTERRUPTED);
 
         switch (*ctx->pattern++) {
-
+ 		
         case SRE_OP_MARK:
             /* set mark */
             /* <MARK> <gid> */
@@ -1834,6 +1838,9 @@ pattern_error(int status)
     case SRE_ERROR_MEMORY:
         PyErr_NoMemory();
         break;
+    case SRE_ERROR_INTERRUPTED:
+	/* An exception has already been raised, so let it fly */
+	break;
     default:
         /* other error codes indicate compiler/engine bugs */
         PyErr_SetString(