get the number from character "\n 0.28\n \n " in R language

I would like to get the 0.28 from the character using R "\n 0.28\n \n ". Maybe I should use sub() function, but I am not sure how to do it.
This is nearly a duplicate of these previous questions: stackoverflow.com/q/14543627/1036500 and stackoverflow.com/q/15451251/1036500 Some of the answers to those questions work here also, eg. as.numeric(gsub("[[:alpha:]]", "", string))

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