is_issn: Check if an argument is an ISSN string

View source: R/id.R

is_issnR Documentation

Check if an argument is an ISSN string

Description

Validates ISSN format including check digit verification.

Usage

is_issn(x)

Arguments

x

(any)
Object to check.

Value

TRUE if x is a valid ISSN string, FALSE otherwise.

References

https://www.loc.gov/issn/check.html

Examples

is_issn("0378-5955")

checkstring documentation built on Sept. 28, 2026, 5:07 p.m.