R grep: is there an AND operator?

Question

Suppose I have the following data frame:

User.Id    Tags 34234      imageUploaded,people.jpg,more,comma,separated,stuff 34234      imageUploaded 12345      people.jpg 

How might I use grep (or some other tool) to only grab rows that include both "imageUploaded" and "people"? In other words, how might I create a subset that includes just the rows with the strings "imageUploaded" AND "people.jpg", regardless of order.

I have tried:

data.people<-data[grep("imageUploaded|people.jpg",results$Tags),] data.people<-data[grep("imageUploaded?=people.jpg",results$Tags),] 

Is there an AND operator? Or perhaps another way to get the intended result?

Answer 1

Thanks to this answer, this regex seems to work. You want to use grepl() which returns a logical to index into your data object. I won't claim to fully understand the inner workings of the regex, but regardless:

x <- c("imageUploaded,people.jpg,more,comma,separated,stuff", "imageUploaded", "people.jpg")  grepl("(?=.*imageUploaded)(?=.*people\\.jpg)", x, perl = TRUE) #----- [1]  TRUE FALSE FALSE