dataquieR (version 2.1.0)

util_extract_matches: return all matches of an expression

Description

return all matches of an expression

Usage

util_extract_matches(data, pattern)

Value

A list with matching elements or NULL (in case on non-matching elements)

Arguments

data

a character vector

pattern

a character string containing a regular expression

Author

Josh O'Brien

See Also

Stack Overflow

Other process_functions: util_abbreviate(), util_all_is_integer(), util_attach_attr(), util_bQuote(), util_backtickQuote(), util_coord_flip(), util_count_NA(), util_par_pmap(), util_setup_rstudio_job(), util_suppress_output()

Examples

if (FALSE)  # not exported, so not tested
dat0 <- list("a sentence with citation (Ref. 12), (Ref. 13), and then (Ref. 14)",
  "another sentence without reference")
pat <- "Ref. (\\d+)"
util_extract_matches(dat0, pat)