“'\w' is an unrecognized escape” in grep

Question

I\'m using grep in some projects in R (which uses a perl=TRUE flag) and for the life of me I can\'t figure out why R keeps throwing errors. My query is as follo

Answer 1

You need to escape the backslashes one more time in r.

d$SomeColumn[grep("(?ix)<VNW[^;]*;(dis|dat)> \\w*<N\\(", d$Right, perl=TRUE)] <- 1

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