R: Look up a multiple patterns and indicate their presence in...

txt_grepl {udpipe}

R Documentation

Look up a multiple patterns and indicate their presence in text

Description

A variant of grepl which allows to specify multiple regular expressions and allows to combine the result of these into one logical vector.
You can specify how to combine the results of the regular expressions by specifying an aggregate function like all, any, sum.

Usage

txt_grepl(
  x,
  pattern,
  FUN = all,
  ignore.case = FALSE,
  perl = FALSE,
  fixed = FALSE,
  useBytes = FALSE,
  ...
)

Arguments

`x`	a character vector
`pattern`	a character vector containing one or several regular expressions
`FUN`	a function to apply to combine the results ot the different regular expressions for each element of `x`. Defaults to `all`.
`ignore.case`	passed on to `grepl`
`perl`	passed on to `grepl`
`fixed`	passed on to `grepl`
`useBytes`	passed on to `grepl`
`...`	further arguments passed on to `FUN`

Value

a logical vector with the same length as x with the result of the call to FUN applied elementwise to each result of grepl for each pattern

Examples

x <- c("--A--", "--B--", "--ABC--", "--AC--", "Z")
txt_grepl(x, pattern = c("A", "C"), FUN = all)
txt_grepl(x, pattern = c("A", "C"), FUN = any)
txt_grepl(x, pattern = c("A", "C"), FUN = sum)
data.frame(x = x, 
           A_and_C = txt_grepl(x, pattern = c("A", "C"), FUN = all),
           A_or_C  = txt_grepl(x, pattern = c("A", "C"), FUN = any),
           A_C_n   = txt_grepl(x, pattern = c("A", "C"), FUN = sum))
txt_grepl(x, pattern = "A|C")