Project Status: Active - The project has reached a stable, usable state and is being actively developed.

A set of predicates and assertions for checking the properties of (country independent) complex data types. Most of the documentation is on the assertive page. End-users will usually want to use assertive directly.


To install the stable version, type:


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


Then you can install the package using



is_cas_number checks character vectors for Chemical Abstracts Service registry numbers.

is_credit_card_number checks character vectors for credit card numbers.

is_email_address checks character vectors

is_hex_color (and its synonym, is_hex_colour) check character vectors for hexadecimal colors.

is_honorific checks character vectors for honorifcs, like Mr and Mrs.

is_ip_address checks character vectors for Internet Protocol addresses.

is_isbn_code checks character vectors for International Standard Book Numbers. is_isbn10_code and is_isbn13_code check only for the 10/13 digit ISBNs.


Predicates all return a vector and have two corresponding assertions. For example, is_cas_number has assert_all_are_cas_numbers and assert_any_are_cas_numbers.