Merge from ruby_1_8.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_8_7@16166 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 0 deletions

diff --git a/regex.c b/regex.c
index a7a831286e..45f7e20738 100644
--- a/regex.c
+++ b/regex.c
@@ -3177,6 +3177,10 @@ re_search(bufp, string, size, startpos, range, regs)
   /* Check for out-of-range starting position.  */
   if (startpos < 0  ||  startpos > size)
     return -1;
+  if (!string) {
+    if (size == 0) string = "";
+    else return -1;
+  }
 
   /* Update the fastmap now if not correct already.  */
   if (fastmap && !bufp->fastmap_accurate) {