udpipe: txt_contains – R documentation

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txt_contains

Check if text contains a certain pattern

Description

Look up text which has a certain pattern. This pattern lookup is performed by executing a regular expression using grepl.

Usage

txt_contains(x, patterns, value = FALSE, ignore.case = TRUE, ...)

Arguments

`x`	a character vector with text
`patterns`	a regular expression which might be contained in `x`, a vector of these or a list of pattern elements where the list elements `include` and `exclude` indicate to find a pattern in `x` while excluding elements which have another pattern
`value`	logical, indicating to return the elements of `x` where the pattern was found or just a logical vector. Defaults to FALSE indicating to return a logical.
`ignore.case`	logical, if set to `FALSE`, the pattern matching is case sensitive and if TRUE, case is ignored during matching. Passed on to `grepl`
`...`	other parameters which can be passed on to `grepl` e.g. fixed/perl/useBytes

Value

a logical vector of the same length as x indicating if one of the patterns was found in x.
Or the vector of elements of x where the pattern was found in case argument value is set to TRUE

Examples

x <- c("The cats are eating catfood", 
       "Our cat is eating the catfood", 
       "the dog eats catfood, he likes it", 
       NA)
txt_contains(x, patterns = c("cat", "dog")) 
txt_contains(x, patterns = c("cat", "dog"), value = TRUE) 
txt_contains(x, patterns = c("eats"), value = TRUE) 
txt_contains(x, patterns = c("^The"), ignore.case = FALSE, value = TRUE) 
txt_contains(x, patterns = list(include = c("cat"), exclude = c("dog")), 
             value = TRUE) 
txt_contains(x, "cat") & txt_contains(x, "dog")

udpipe

Tokenization, Parts of Speech Tagging, Lemmatization and Dependency Parsing with the 'UDPipe' 'NLP' Toolkit

v0.8.5

MPL-2.0

Authors

Jan Wijffels [aut, cre, cph], BNOSAC [cph], Institute of Formal and Applied Linguistics, Faculty of Mathematics and Physics, Charles University in Prague, Czech Republic [cph], Milan Straka [ctb, cph], Jana Straková [ctb, cph]

Initial release