Index: Objects/stringlib/find.h
===================================================================
--- Objects/stringlib/find.h	(revision 76720)
+++ Objects/stringlib/find.h	(working copy)
@@ -32,20 +32,19 @@
                 const STRINGLIB_CHAR* sub, Py_ssize_t sub_len,
                 Py_ssize_t offset)
 {
-    /* XXX - create reversefastsearch helper! */
-    if (sub_len == 0) {
-        if (str_len < 0)
-            return -1;
-	return str_len + offset;
-    } else {
-	Py_ssize_t j, pos = -1;
-	for (j = str_len - sub_len; j >= 0; --j)
-            if (STRINGLIB_CMP(str+j, sub, sub_len) == 0) {
-                pos = j + offset;
-                break;
-            }
-        return pos;
-    }
+    Py_ssize_t pos;
+
+    if (str_len < 0)
+        return -1;
+    if (sub_len == 0)
+        return str_len + offset;
+
+    pos = fastsearch(str, str_len, sub, sub_len, FAST_RSEARCH);
+
+    if (pos >= 0)
+        pos += offset;
+
+    return pos;
 }
 
 Py_LOCAL_INLINE(Py_ssize_t)
@@ -64,10 +63,7 @@
     if (end < 0)
         end = 0;
 
-    return stringlib_find(
-        str + start, end - start,
-        sub, sub_len, start
-        );
+    return stringlib_find(str + start, end - start, sub, sub_len, start);
 }
 
 Py_LOCAL_INLINE(Py_ssize_t)
Index: Objects/stringlib/fastsearch.h
===================================================================
--- Objects/stringlib/fastsearch.h	(revision 76720)
+++ Objects/stringlib/fastsearch.h	(working copy)
@@ -5,7 +5,7 @@
 
 /* fast search/count implementation, based on a mix between boyer-
    moore and horspool, with a few more bells and whistles on the top.
-   for some more background, see: http://effbot.org/stringlib.htm */
+   for some more background, see: http://effbot.org/zone/stringlib.htm */
 
 /* note: fastsearch may access s[n], which isn't a problem when using
    Python's ordinary string types, but may cause problems if you're
@@ -16,6 +16,7 @@
 
 #define FAST_COUNT 0
 #define FAST_SEARCH 1
+#define FAST_RSEARCH 2
 
 Py_LOCAL_INLINE(Py_ssize_t)
 fastsearch(const STRINGLIB_CHAR* s, Py_ssize_t n,
@@ -41,51 +42,93 @@
                 if (s[i] == p[0])
                     count++;
             return count;
-        } else {
+        } else if (mode == FAST_SEARCH) {
             for (i = 0; i < n; i++)
                 if (s[i] == p[0])
                     return i;
+        } else {    /* FAST_RSEARCH */
+            for (i = n - 1; i > -1; i--)
+                if (s[i] == p[0])
+                    return i;
         }
         return -1;
     }
 
     mlast = m - 1;
-
-    /* create compressed boyer-moore delta 1 table */
     skip = mlast - 1;
-    /* process pattern[:-1] */
-    for (mask = i = 0; i < mlast; i++) {
-        mask |= (1 << (p[i] & 0x1F));
-        if (p[i] == p[mlast])
-            skip = mlast - i - 1;
-    }
-    /* process pattern[-1] outside the loop */
-    mask |= (1 << (p[mlast] & 0x1F));
 
-    for (i = 0; i <= w; i++) {
-        /* note: using mlast in the skip path slows things down on x86 */
-        if (s[i+m-1] == p[m-1]) {
-            /* candidate match */
-            for (j = 0; j < mlast; j++)
-                if (s[i+j] != p[j])
-                    break;
-            if (j == mlast) {
-                /* got a match! */
-                if (mode != FAST_COUNT)
+    if (mode != FAST_RSEARCH) {
+
+        /* create compressed boyer-moore delta 1 table */
+
+        /* process pattern[:-1] */
+        for (mask = i = 0; i < mlast; i++) {
+            mask |= (1 << (p[i] & 0x1F));
+            if (p[i] == p[mlast])
+                skip = mlast - i - 1;
+        }
+        /* process pattern[-1] outside the loop */
+        mask |= (1 << (p[mlast] & 0x1F));
+
+        for (i = 0; i <= w; i++) {
+            /* note: using mlast in the skip path slows things down on x86 */
+            if (s[i+m-1] == p[m-1]) {
+                /* candidate match */
+                for (j = 0; j < mlast; j++)
+                    if (s[i+j] != p[j])
+                        break;
+                if (j == mlast) {
+                    /* got a match! */
+                    if (mode != FAST_COUNT)
+                        return i;
+                    count++;
+                    i = i + mlast;
+                    continue;
+                }
+                /* miss: check if next character is part of pattern */
+                if (!(mask & (1 << (s[i+m] & 0x1F))))
+                    i = i + m;
+                else
+                    i = i + skip;
+            } else {
+                /* skip: check if next character is part of pattern */
+                if (!(mask & (1 << (s[i+m] & 0x1F))))
+                    i = i + m;
+            }
+        }
+    } else {    /* FAST_RSEARCH */
+
+        /* create compressed boyer-moore delta 1 table */
+
+        /* process pattern[0] outside the loop */
+        mask = (1 << (p[0] & 0x1F));
+        /* process pattern[:0:-1] */
+        for (i = mlast; i > 0; i--) {
+            mask |= (1 << (p[i] & 0x1F));
+            if (p[i] == p[0])
+                skip = i - 1;
+        }
+
+        for (i = w; i >= 0; i--) {
+            /* note: using mlast in the skip path slows things down on x86 */
+            if (s[i] == p[0]) {
+                /* candidate match */
+                for (j = mlast; j > 0; j--)
+                    if (s[i+j] != p[j])
+                        break;
+                if (j == 0)
+                    /* got a match! */
                     return i;
-                count++;
-                i = i + mlast;
-                continue;
+                /* miss: check if previous character is part of pattern */
+                if (!(mask & (1 << (s[i-1] & 0x1F))))
+                    i = i - m;
+                else
+                    i = i - skip;
+            } else {
+                /* skip: check if previous character is part of pattern */
+                if (!(mask & (1 << (s[i-1] & 0x1F))))
+                    i = i - m;
             }
-            /* miss: check if next character is part of pattern */
-            if (!(mask & (1 << (s[i+m] & 0x1F))))
-                i = i + m;
-            else
-                i = i + skip;
-        } else {
-            /* skip: check if next character is part of pattern */
-            if (!(mask & (1 << (s[i+m] & 0x1F))))
-                i = i + m;
         }
     }