grepl.sub: Subset a data frame if a specified pattern is found in a...
In DataCombine: Tools for Easily Combining and Cleaning Data Sets

Subset a data frame if a specified pattern is found in a character string

1	grepl.sub(data, pattern, Var, keep.found = TRUE, ...)

`data`	data frame.
`pattern`	character vector containing a regular expression to be matched in the given character vector.
`Var`	character vector of the variables that the pattern should be found in.
`keep.found`	logical. whether or not to keep observations where the pattern is found (`TRUE`) or not found (`FALSE`).
`...`	arguments to pass to `grepl`.

# Create data frame
ABData <- data.frame(a = c("London, UK", "Oxford, UK", "Berlin, DE",
                    "Hamburg, DE", "Oslo, NO"),
                    b = c(8, 0.1, 3, 2, 1))

# Keep only data from Germany (DE)
ABGermany <- grepl.sub(data = ABData, pattern = "DE", Var = "a")