python how to search an item in a nested list

say I have this list:

li = [["0", "20", "ar"], ["20", "40", "asdasd"], ["50", "199", "bar"], ["24", "69", "sarkozy"]]

Now, forget about the numbers, they are something that let me recognize the position of string. So basically, given that I have the string "ar" in hand, how can I extract all the lists that contain "ar"?

new_li = [[开发者_如何学Go"50", "199", "bar"], ["24", "69", "sarkozy"]]

How can I obtain this list?

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>>> [x for x in li if 'ar' in x[2]]
[['0', '20', 'ar'], ['50', '199', 'bar'], ['24', '69', 'sarkozy']]