Selecting a subset of columns in a data.table

Question

I\'d like to print all the columns of a data table dt except one of them named V3 but don\'t want to refer to it by number but by name. This is the

Answer 1

From version 1.12.0 onwards, it is also possible to select columns using regular expressions on their names:

iris_DT <- as.data.table(iris)

iris_DT[, .SD, .SDcols = patterns(".e.al")]