[R] matching strings in a list

[tryingtolearn]

Say I have a list: 
[[1]] "I like google"
[[2]] "Hi Google google" 
[[3]] "what's up" 

and they are tweets. And I want to find out how many tweets mention google
(the answer should be 2). 
If I string split and unlist them, then I would get the answer of 3. How do
I make sure I get just 2? 



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