A set of predicates and assertions for checking the properties of strings. Most of the documentation is on the assertive page. End-users will usually want to use assertive directly.

To install the stable version, type:

install.packages("assertive.strings")

To install the development version, you first need the devtools package.

install.packages("devtools")

Then you can install the assertive.strings package using

library(devtools)
install_bitbucket("richierocks/assertive.strings")

is_empty_character, is_non_empty_character, is_missing_or_empty_character, and is_non_missing_nor_empty_character check for empty and missing (or not) character vectors.

is_an_empty_string, is_a_non_empty_string, is_a_missing_or_empty_string, and is_a_non_missing_nor_empty_string do the same, for single strings.

is_numeric_string checks for strings that contain numbers.

is_single_character checks for single characters.

is_matching_fixed, is_matching_regex, is_not_matching_fixed, and is_not_matching_regex all check whether a string matches a pattern or not.

Predicates that return a vector have two corresponding assertions. For example, is_numeric_string has assert_all_are_numeric_strings and assert_any_are_numeric_strings.

Predicates returning a single logical value have one corresponding assertion. For example, is_an_empty_string has assert_is_an_empty_string.

character_to_list_of_integer_vectors converts a character vector of numbers to a list of integer vectors.