Last chance! 50% off unlimited learning
Sale ends in
A convenience function to tune the ICU regular expressions matcher's behavior,
e.g. in stri_count_regex
and other stringi-search-regex functions.
stri_opts_regex(case_insensitive, comments, dotall, literal, multiline,
unix_lines, uword, error_on_unknown_escapes, ...)logical; enable case insensitive matching [regex flag (?i)]
logical; allow white space and comments within patterns [regex flag (?x)]
logical; if set, `.` matches line terminators,
otherwise matching of `.` stops at a line end [regex flag (?s)]
logical; if set, treat the entire pattern as a literal string: metacharacters or escape sequences in the input sequence will be given no special meaning; note that in most cases you would rather use the stringi-search-fixed facilities in this case
logical; controls the behavior of `$` and `^`.
If set, recognize line terminators within a string, otherwise,
match only at start and end of input string [regex flag (?m)]
logical; Unix-only line endings.
When this mode is enabled, only U+000a is recognized as a
line ending by `.`, `$`, and `^`.
logical; Unicode word boundaries.
If set, uses the Unicode TR 29 definition of word boundaries;
warning: Unicode word boundaries are quite different from traditional
regex word boundaries. [regex flag (?w)]
See http://unicode.org/reports/tr29/#Word_Boundaries
logical; whether to generate an error on unrecognized backslash escapes; if set, fail with an error on patterns that contain backslash-escaped ASCII letters without a known special meaning; otherwise, these escaped letters represent themselves
any other arguments to this function are purposely ignored
Returns a named list object; missing settings are left with default values.
Note that some regex settings may be changed using ICU regex flags
inside regexes. For example, "(?i)pattern" does
a case-insensitive match of a given pattern,
see the ICU User Guide entry on Regular Expressions
in the References section or stringi-search-regex.
enum URegexpFlag: Constants for Regular Expression Match Modes
-- ICU4C API Documentation,
http://www.icu-project.org/apiref/icu4c/uregex_8h.html
Regular Expressions -- ICU User Guide, http://userguide.icu-project.org/strings/regexp
Other search_regex: stringi-search-regex,
stringi-search
# NOT RUN {
stri_detect_regex("ala", "ALA") # case-sensitive by default
stri_detect_regex("ala", "ALA", opts_regex=stri_opts_regex(case_insensitive=TRUE))
stri_detect_regex("ala", "ALA", case_insensitive=TRUE) # equivalent
stri_detect_regex("ala", "(?i)ALA") # equivalent
# }
Run the code above in your browser using DataLab