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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/v1_1r@439 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/regex.c b/regex.c
index a1aeb2ec6f..35a55ad23e 100644
--- a/regex.c
+++ b/regex.c
@@ -3062,7 +3062,7 @@ typedef union
         this in conjunction with AT_STRINGS_BEG.  */
 #define IS_A_LETTER(d) (SYNTAX(*(d)) == Sword ||			\
 			(current_mbctype ?				\
-			 mbctab[*(d)] == 1 :				\
+			 (mbctab[*(d)] == 1 && (d)+1<dend):		\
 			 SYNTAX(*(d)) == Sword2))
 
 static void