followup for for the bug#5686

myisam/ft_parser.c

@@ -147,8 +147,10 @@ byte ft_get_word(CHARSET_INFO *cs, byte **start, byte *end,
     for (word->pos=doc; doc<end; length++, mbl=my_mbcharlen(cs, *(uchar *)doc), doc+=(mbl ? mbl : 1))
       if (true_word_char(cs,*doc))
         mwc=0;
-      else if (!misc_word_char(*doc) || mwc++)
+      else if (!misc_word_char(*doc) || mwc)
         break;
+      else
+        mwc++;
 
     param->prev='A'; /* be sure *prev is true_word_char */
     word->len= (uint)(doc-word->pos) - mwc;

mysql-test/r/fulltext.result

@@ -432,4 +432,7 @@ INSERT INTO t1 VALUES('testword\'\'');
 SELECT a FROM t1 WHERE MATCH a AGAINST('testword' IN BOOLEAN MODE);
 a
 testword''
+SELECT a FROM t1 WHERE MATCH a AGAINST('testword\'\'' IN BOOLEAN MODE);
+a
+testword''
 DROP TABLE t1;

mysql-test/t/fulltext.test

@@ -354,6 +354,7 @@ SET myisam_repair_threads=@@global.myisam_repair_threads;
 #
 INSERT INTO t1 VALUES('testword\'\'');
 SELECT a FROM t1 WHERE MATCH a AGAINST('testword' IN BOOLEAN MODE);
+SELECT a FROM t1 WHERE MATCH a AGAINST('testword\'\'' IN BOOLEAN MODE);
 DROP TABLE t1;
 
 # End of 4.1 tests