[R] using grep

[kayj]

Hi All,

I have a character vector with naems of cities in the us. I need to extract
the number that appear after the word "New York", for example,

x<-c("P Los Angeles44AZ", "P New York722AZ", "K New York20")

I want the results to be 

722, 20


cab I use the grep function, if so how?
I appreciate your help, thanks,

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