DataCombine (version 0.1.13)

grepl.sub: Subset a data frame if a specified pattern is found in a character string

Description

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

Usage

grepl.sub(data, patterns, Var, keep.found = TRUE, useBytes = TRUE)

Arguments

data

data frame.

patterns

character vector containing a regular expressions 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).

useBytes

logical. If TRUE the matching is done byte-by-byte rather than character-by-character. See grep.

Examples

# 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, patterns = "DE", Var = "a")