patch for re.sub bug, by AMK.
diff --git a/Modules/pypcre.c b/Modules/pypcre.c
index 69d6c22..796f3b4 100644
--- a/Modules/pypcre.c
+++ b/Modules/pypcre.c
@@ -4424,7 +4424,8 @@
int
pcre_exec(const pcre *external_re, const pcre_extra *external_extra,
- const char *subject, int length, int options, int *offsets, int offsetcount)
+ const char *subject, int length, int start_pos, int options,
+ int *offsets, int offsetcount)
{
/* The "volatile" directives are to make gcc -Wall stop complaining
that these variables can be clobbered by the longjmp. Hopefully
@@ -4433,7 +4434,7 @@
int first_char = -1;
match_data match_block;
const uschar *start_bits = NULL;
-const uschar *start_match = (const uschar *)subject;
+const uschar *start_match = (const uschar *)subject + start_pos;
const uschar *end_subject;
const real_pcre *re = (const real_pcre *)external_re;
const real_pcre_extra *extra = (const real_pcre_extra *)external_extra;