Is there a way to edit last search/substitution pattern in vi?

I made a mistake in a complex search pattern in vi editor and want to modify it now.

I know v开发者_开发知识库i remembers the last search pattern but can I view and edit it ?

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Modern vi/vim keeps a history of : and / command used in vi. So you can just press up arrow key to get your search pattern again and then edit it.