diff -u lib_mysqludf_preg-1.0.1/lib_mysqludf_preg_position.c mysql-preg/lib_mysqludf_preg_position.c
--- lib_mysqludf_preg-1.0.1/lib_mysqludf_preg_position.c	2009-02-15 23:21:41.000000000 +0000
+++ mysql-preg/lib_mysqludf_preg_position.c	2012-09-04 13:43:33.000000000 +0000
@@ -246,7 +246,7 @@
             groupnum = pregGetGroupNum( re , args , 2 ) ;
 
         // If groupnum found, get the offset
-        if( groupnum >= 0 && groupnum < oveccount )
+        if( groupnum >= 0 && groupnum < (oveccount/3) )
         {
             // ovec is in pairs of starting and ending offsets.  (ie. 
             // ovec[0] is start of whole match, ovec[1] is end of whole