Multi-value grep/match in R

	> df<-data.frame(names=c("a","b","c"),age=c(1,2,3))
	> df
	names age
	1 a 1
	2 b 2
	3 c 3
	values_to_grep<-c("a","b")
	> unique (grep(paste(values_to_grep,collapse="|"),
	+ df$names, value=TRUE))
	[1] "a" "b"

view raw example_multi_grep hosted with ❤ by GitHub

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Very useful if you want to store images / genome indexes etc.