stri_detect {stringi} | R Documentation |
These functions determine, for each string in str
,
if there is at least one match to a corresponding pattern
.
stri_detect(str, ..., regex, fixed, coll, charclass) stri_detect_fixed(str, pattern, negate = FALSE, ..., opts_fixed = NULL) stri_detect_charclass(str, pattern, negate = FALSE) stri_detect_coll(str, pattern, negate = FALSE, ..., opts_collator = NULL) stri_detect_regex(str, pattern, negate = FALSE, ..., opts_regex = NULL)
str |
character vector with strings to search in |
... |
supplementary arguments passed to the underlying functions,
including additional settings for |
pattern, regex, fixed, coll, charclass |
character vector defining search patterns; for more details refer to stringi-search |
negate |
single logical value; whether a no-match is rather of interest |
opts_collator, opts_fixed, opts_regex |
a named list used to tune up
a search engine's settings; see
|
Vectorized over str
and pattern
.
If pattern
is empty, then the result is NA
and a warning is generated.
stri_detect
is a convenience function.
It calls either stri_detect_regex
,
stri_detect_fixed
, stri_detect_coll
,
or stri_detect_charclass
, depending on the argument used.
Relying on these underlying functions will make your code run slightly
faster.
See also stri_startswith
and stri_endswith
for testing whether a string starts or ends with a given pattern
match, respectively. Moreover, see stri_subset
for a character vector subsetting.
Each function returns a logical vector.
Other search_detect: stri_startswith
,
stringi-search
stri_detect_fixed(c("stringi R", "REXAMINE", "123"), c('i', 'R', '0')) stri_detect_fixed(c("stringi R", "REXAMINE", "123"), 'R') stri_detect_charclass(c("stRRRingi","REXAMINE", "123"), c("\\p{Ll}", "\\p{Lu}", "\\p{Zs}")) stri_detect_regex(c("stringi R", "REXAMINE", "123"), 'R.') stri_detect_regex(c("stringi R", "REXAMINE", "123"), '[[:alpha:]]*?') stri_detect_regex(c("stringi R", "REXAMINE", "123"), '[a-zC1]') stri_detect_regex(c("stringi R", "REXAMINE", "123"), '( R|RE)') stri_detect_regex("stringi", "STRING.", case_insensitive=TRUE)