I found a dust abount 'regexpengine' in options.txt, and removed it.
Please check an attached patch.
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diff -r e782f5be8263 runtime/doc/options.txt
--- a/runtime/doc/options.txt Thu May 23 22:43:08 2013 +0200
+++ b/runtime/doc/options.txt Sat May 25 04:14:37 2013 +0900
@@ -5516,7 +5516,7 @@
matches will be highlighted. This is used to avoid that Vim hangs
when using a very complicated pattern.
- *'regexpengine''* *'re'*
+ *'regexpengine'* *'re'*
'regexpengine' 're' number (default 0)
global
{not in Vi}
