
Match function
re_matches(
data,
pattern,
global = FALSE,
options = NULL,
locations = FALSE,
...
)
character vector to match against
regular expression to use for matching
use global matching
regular expression options
rather than returning the values of the matched (or
captured) string, return a data.frame
of the match locations in the
string.
options passed to regexpr or gregexpr
if no captures, returns a logical vector the same length as the
input character vector specifying if the relevant value matched or not. If
there are captures in the regular expression, returns a data.frame
with a
column for each capture group. If global
is TRUE
, returns a
list of data.frame
s.
regexp
Section "Perl-like Regular Expressions" for a
discussion of the supported options
# NOT RUN {
string <- c("this is a", "test string")
re_matches(string, rex("test")) # FALSE FALSE
# named capture
re_matches(string, rex(capture(alphas, name = "first_word"), space,
capture(alphas, name = "second_word")))
# first_word second_word
# 1 this is
# 2 test string
# capture returns NA when it fails to match
re_matches(string, rex(capture("test")))
# 1
# 1 test
# 2 <NA>
# }
Run the code above in your browser using DataLab